The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:13830 advisory.

    Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind.
    It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL     drivers and authentication plug-ins are provided as subpackages.

    Security Fix(es):

    * dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command     (CVE-2025-59032)

    * dovecot: denial of service via crafted message before authentication (CVE-2026-27858)

    * dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-13857 advisory.

    - fix CVE-2026-27858: denial of service via crafted message before authentication (RHEL-161639)
    - fix CVE-2025-59032: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE     command (RHEL-162287)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:17625 advisory.

    Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind.
    It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL     drivers and authentication plug-ins are provided as subpackages.

    Security Fix(es):

    * dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command     (CVE-2025-59032)

    * dovecot: denial of service via crafted message before authentication (CVE-2026-27858)

    * dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2026:0119 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2025-59032:
    ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to     crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve     port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly     available exploits are known.

    CVE-2026-27857:
    Sending NOOP (((...))) command with 4000 parenthesis open+close results in ~1MB extra memory usage.
    Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time     periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and     create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and     killing the process and its other proxied connections. Attacker could connect possibly from even a single     IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit     and killing the process and its other proxied connections. Install fixed version, there is no other     remediation. No publicly available exploits are known.

    CVE-2026-27858:
    Attacker can send a specifically crafted message before authentication that causes managesieve to allocate     large amount of memory.
    Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access     to managesieve protocol, or install fixed version. No publicly available exploits are known.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6197 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6197-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     April 05, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : dovecot     CVE ID         : CVE-2025-59031 CVE-2025-59032 CVE-2026-27855                      CVE-2026-27856 CVE-2026-27857 CVE-2026-27858                      CVE-2026-27859 CVE-2026-59028 CVE-2026-24031                      CVE-2026-27860 CVE-2026-0394

    Multiple vulnerabilities have been discovered in the Dovecot IMAP server     which way result in denial of service, SQL injection, path traversal,     replay attacks or timing side channel attacks.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 1:2.3.19.1+dfsg1-2.1+deb12u2.

    For the stable distribution (trixie), these problems have been fixed in     version 1:2.4.1+dfsg1-6+deb13u4.

    We recommend that you upgrade your dovecot packages.

    For the detailed security status of dovecot please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/dovecot

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:13830 advisory.

    * dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command     (CVE-2025-59032)
      * dovecot: denial of service via crafted message before authentication (CVE-2026-27858)
      * dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:17630 advisory.

    Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind.
    It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL     drivers and authentication plug-ins are provided as subpackages.

    Security Fix(es):

    * dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command     (CVE-2025-59032)

    * dovecot: denial of service via crafted message before authentication (CVE-2026-27858)

    * dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1641-1 advisory.

    - CVE-2025-59031: decode2text.sh OOXML extraction may follow symlinks and read unintended files during     indexing (bsc#1260895).
    - CVE-2025-59032: pigeonhole: ManageSieve panic occurs with sieve-connect as a client (bsc#1260902).
    - CVE-2026-27855: OTP driver vulnerable to replay attack (bsc#1260900).
    - CVE-2026-27856: Doveadm credentials were not checked using timing-safe checking function (bsc#1260899).
    - CVE-2026-27857: sending excessive parenthesis causes imap-login to use excessive memory (bsc#1260898).
    - CVE-2026-27858: pigeonhole: managesieve-login can allocate large amount of memory during authentication     (bsc#1260901).
    - CVE-2026-27859: excessive RFC 2231 MIME parameters in email would can excessive CPU usage (bsc#1260897).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-13498 advisory.

    - fix CVE-2026-27858: denial of service via crafted message before authentication (RHEL-161625)
    - fix CVE-2025-59032: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE     command (RHEL-162273)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0376 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2025-59032:
    ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to     crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve     port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly     available exploits are known.

    CVE-2026-27857:
    Sending NOOP (((...))) command with 4000 parenthesis open+close results in ~1MB extra memory usage.
    Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time     periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and     create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and     killing the process and its other proxied connections. Attacker could connect possibly from even a single     IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit     and killing the process and its other proxied connections. Install fixed version, there is no other     remediation. No publicly available exploits are known.

    CVE-2026-27858:
    Attacker can send a specifically crafted message before authentication that causes managesieve to allocate     large amount of memory.
     Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access     to managesieve protocol, or install fixed version. No publicly available exploits are known.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:19149 advisory.

    * dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command     (CVE-2025-59032)

    * dovecot: denial of service via crafted message before authentication (CVE-2026-27858)

    * dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-4349d04c20 advisory.

    updated to 2.4.3 which includes several security fixes

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4556 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4556-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     May 01, 2026                                  https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : dovecot     Version        : 1:2.3.13+dfsg1-2+deb11u3     CVE ID         : CVE-2025-59031 CVE-2025-59032 CVE-2026-0394 CVE-2026-27855                      CVE-2026-27856 CVE-2026-27857 CVE-2026-27858 CVE-2026-27859

    Multiple vulnerabilities were discovered in dovecot, a POP3/IMAP server,     which could lead to Denial of Service, information leak, path traversal,     authentication bypass, replay attacks or timing side channel attacks.

    CVE-2025-59031

        The decode2text.sh example script, which was installed into         dovecot-core/examples, was found handle zip-style attachment in an         unsafe manner.  In particular, OOXML extraction may follow symlinks         and read unintended files during indexing.  The script is no longer         installed.

    CVE-2025-59032

        It was found that the ManageSieve AUTHENTICATE command crashes the         ManageSieve service when using literal as SASL initial response,         leading to Denial of Service.

    CVE-2026-0394

        A pass traversal vulnerability was discovered in the passwd-file         passdb/userdb when dovecot has been configured to use per-domain         passwd files, allowing inadvertently reading /etc/passwd in some         situations.  If this file contains passwords, it can be used to         authenticate wrongly, or if this is userdb, it can incorrectly make         system users appear valid users.

    CVE-2026-27855

        The OTP authentication driver was found to be vulnerable to replay         attack if auth cache is enabled the and username is altered in         passdb.  An attacker able to observe an OTP exchange is therefore         able to impersonate the user.

    CVE-2026-27856

        Doveadm credentials were not checked using timing-safe checking         functions.  An attacker can exploit this issue to discover configured         credentials, leading into full access to the affected component.

    CVE-2026-27857

        It was discovered that sending excessive parenthesis caused the         imap-login process to use excessive memory, leading to Denial of         Service.

    CVE-2026-27858

        It was discovered that the managesieve-login process could allocate         large amount of memory during authentication via specifically crafted         message, leading to Denial of Service.

    CVE-2026-27859

        It was discovered that excessive RFC 2231 MIME parameters in email         would cause excessive CPU usage, which could lead to Denial of         Service.  Dovecot now limits the number of parameters to process.

    For Debian 11 bullseye, these problems have been fixed in version     1:2.3.13+dfsg1-2+deb11u3.

    We recommend that you upgrade your dovecot packages.

    For the detailed security status of dovecot please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/dovecot

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:26564 advisory.

    Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind.
    It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL     drivers and authentication plug-ins are provided as subpackages.

    Security Fix(es):

    * dovecot: Doveadm: Full access via timing oracle attack in credential verification (CVE-2026-27856)

    * dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command     (CVE-2025-59032)

    * dovecot: denial of service via crafted message before authentication (CVE-2026-27858)

    * dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4617 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4617-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     June 05, 2026                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : dovecot     Version        : 1:2.3.13+dfsg1-2+deb11u4     CVE ID         : CVE-2026-33603 CVE-2026-40020 CVE-2026-42006     Debian Bug     : 1136444

    Multiple vulnerabilities were discovered in dovecot, a POP3/IMAP server,     which could lead to Denial of Service or information leak.

    CVE-2026-33603

        An attacker can use a specially crafted base64 exchange between         Dovecot and Client to fake SCRAM TLS channel binding and later         eavesdrop communications between Dovecot and client as MITM proxy.

    CVE-2026-40020

        An attacker can use the IMAP `SETACL` command to inject the anyone         permission to user's dovecot-acl file even if         `imap_acl_allow_anyone=no`, thereby allowing folders to be spammed         to all users. (The impact was limited to being able to spam folders         to other users. No unexpected access is gained.)

    CVE-2026-42006

        An attacker can cause uncontrolled memory usage with excessive         bracing over IMAP. This stems from an incomplete fix for         CVE-2026-27857.

    For Debian 11 bullseye, these problems have been fixed in version     1:2.3.13+dfsg1-2+deb11u4.

    We recommend that you upgrade your dovecot packages.

    For the detailed security status of dovecot please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/dovecot

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-26564 advisory.

    - fix CVE-2020-12100 resource exhaustion via deeply nested MIME parts (#1866752)
    - fix CVE-2020-12673 out of bound reads in dovecot NTLM implementation (#1866757)
    - fix CVE-2020-12674 crash due to assert in RPA implementation (#1866764)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:21208-1 advisory.

    - Update to v2.4.3
    - CVE-2025-59028: Invalid base64 authentication can cause DoS for other logins (bsc#1260894).
    - CVE-2025-59031: decode2text.sh OOXML extraction may follow symlinks and read unintended files during     indexing       (bsc#1260895).
    - CVE-2025-59032: pigeonhole: ManageSieve panic occurs with sieve-connect as a client (bsc#1260902).
    - CVE-2026-24031: SQL injection possible if auth_username_chars is configured empty. Fixed escaping to     always happen.
      v2.4 regression (bsc#1260896).
    - CVE-2026-27855: OTP driver vulnerable to replay attack (bsc#1260900).
    - CVE-2026-27856: Doveadm credentials were not checked using timing-safe checking function (bsc#1260899).
    - CVE-2026-27857: sending excessive parenthesis causes imap-login to use excessive memory (bsc#1260898).
    - CVE-2026-27858: pigeonhole: managesieve-login can allocate large amount of memory during authentication     (bsc#1260901).
    - CVE-2026-27859: excessive RFC 2231 MIME parameters in email would can excessive CPU usage (bsc#1260897).
    - CVE-2026-27860: LDAP query injection possible if auth_username_chars is configured empty. Fixed escaping     to always       happen. v2.4 regression (bsc#1260893).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
312251	RHEL 8 : dovecot (RHSA-2026:13830)	Nessus	Red Hat Local Security Checks	2026/5/5	2026/5/5	high
312673	Oracle Linux 9 : dovecot (ELSA-2026-13857)	Nessus	Oracle Linux Local Security Checks	2026/5/6	2026/5/6	high
314754	RHEL 9 : dovecot (RHSA-2026:17625)	Nessus	Red Hat Local Security Checks	2026/5/14	2026/5/14	high
316587	Alibaba Cloud Linux 3 : 0119: dovecot (ALINUX3-SA-2026:0119)	Nessus	Alibaba Cloud Linux Local Security Checks	2026/5/25	2026/5/25	high
305037	Debian dsa-6197 : dovecot-auth-lua - security update	Nessus	Debian Local Security Checks	2026/4/5	2026/5/19	high
312294	AlmaLinux 8 : dovecot (ALSA-2026:13830)	Nessus	Alma Linux Local Security Checks	2026/5/5	2026/5/5	high
314691	RHEL 9 : dovecot (RHSA-2026:17630)	Nessus	Red Hat Local Security Checks	2026/5/14	2026/5/14	high
311743	SUSE SLES12 Security Update : dovecot22 (SUSE-SU-2026:1641-1)	Nessus	SuSE Local Security Checks	2026/5/2	2026/5/2	medium
312317	Oracle Linux 10 : dovecot (ELSA-2026-13498)	Nessus	Oracle Linux Local Security Checks	2026/5/5	2026/5/5	high
316675	TencentOS Server 3: dovecot (TSSA-2026:0376)	Nessus	Tencent Local Security Checks	2026/5/26	2026/5/26	high
318642	RockyLinux 10 : dovecot (RLSA-2026:19149)	Nessus	Rocky Linux Local Security Checks	2026/6/4	2026/6/4	high
313028	Fedora 44 : dovecot (2026-4349d04c20)	Nessus	Fedora Local Security Checks	2026/5/7	2026/5/7	high
321107	Debian dla-4556 : dovecot-auth-lua - security update	Nessus	Debian Local Security Checks	2026/6/15	2026/6/15	medium
321358	RHEL 7 : dovecot (RHSA-2026:26564)	Nessus	Red Hat Local Security Checks	2026/6/17	2026/6/17	medium
318856	Debian dla-4617 : dovecot-auth-lua - security update	Nessus	Debian Local Security Checks	2026/6/5	2026/6/5	medium
334524	Oracle Linux 7 : dovecot (ELSA-2026-26564)	Nessus	Oracle Linux Local Security Checks	2026/8/11	2026/8/11	medium
309128	SUSE SLES16 Security Update : dovecot24 (SUSE-SU-2026:21208-1)	Nessus	SuSE Local Security Checks	2026/4/22	2026/5/1	high

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