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 Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_19364 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 CIQ 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 Rocky Linux 10.1 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_13498 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 CIQ 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 CentOS Linux 6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare CENTOS6:CLSA-2026:1778250399 advisory.

  - 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-2026-27857)

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

The version of dovecot installed on the remote host is prior to 2.2.36-6. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3252 advisory.

    Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An     attacker can use this to determine the configured credentials. Figuring out the credential will lead into     full access to the affected component. Limit access to the doveadm http service port, install fixed     version. No publicly available exploits are known. (CVE-2026-27856)

    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-2026-27857)

Tenable has extracted the preceding description block directly from the tested product 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 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:13498 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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:13857 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 MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-611:02 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 MiracleLinux 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-2026:17626 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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:18053 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 Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:19149 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 Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:19455 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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:19364 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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-19149 advisory.

    - fix CVE-2026-27858: denial of service via crafted message before authentication (RHEL-161626)
    - fix CVE-2025-59032: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE     command (RHEL-162274)

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
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
353943	Rocky Linux 9 [CIQ] Security Update: dovecot / dovecot-debuginfo / dovecot-debugsource / dovecot-devel / etc Multiple Vulnerabilities (crlsa-2026_19364)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	high
354933	Rocky Linux 10.1 [CIQ] Security Update: dovecot / dovecot-debuginfo / dovecot-debugsource / dovecot-devel / etc Multiple Vulnerabilities (crlsa-2026_13498)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	high
360255	CentOS Linux 6 [TuxCare] Security Update: dovecot / dovecot-devel / dovecot-mysql / dovecot-pgsql / etc (CENTOS6:CLSA-2026:1778250399)	Nessus	CentOS Local Security Checks	2026/10/1	2026/10/1	high
311199	Amazon Linux 2 : dovecot, --advisory ALAS2-2026-3252 (ALAS-2026-3252)	Nessus	Amazon Linux Local Security Checks	2026/4/30	2026/4/30	medium
312682	AlmaLinux 10 : dovecot (ALSA-2026:13498)	Nessus	Alma Linux Local Security Checks	2026/5/6	2026/5/6	high
313035	RockyLinux 9 : dovecot (RLSA-2026:13857)	Nessus	Rocky Linux Local Security Checks	2026/5/7	2026/5/7	high
314418	MiracleLinux 8 : dovecot-2.3.16-7.el8_10 (AXSA:2026-611:02)	Nessus	Miracle Linux Local Security Checks	2026/5/13	2026/5/13	high
314696	RHEL 9 : dovecot (RHSA-2026:17626)	Nessus	Red Hat Local Security Checks	2026/5/14	2026/5/14	high
315185	RHEL 8 : dovecot (RHSA-2026:18053)	Nessus	Red Hat Local Security Checks	2026/5/18	2026/5/18	high
315507	RHEL 10 : dovecot (RHSA-2026:19149)	Nessus	Red Hat Local Security Checks	2026/5/19	2026/5/19	high
315556	RHEL 8 : dovecot (RHSA-2026:19455)	Nessus	Red Hat Local Security Checks	2026/5/20	2026/5/20	high
318038	RockyLinux 9 : dovecot (RLSA-2026:19364)	Nessus	Rocky Linux Local Security Checks	2026/5/30	2026/5/30	high
327491	Oracle Linux 10 : dovecot (ELSA-2026-19149)	Nessus	Oracle Linux Local Security Checks	2026/7/17	2026/7/17	high

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