The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4525 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4525-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Andrej Shadura     April 09, 2026                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : libyaml-syck-perl     Version        : 1.34-1+deb11u1     CVE ID         : CVE-2025-11683 CVE-2026-4177

    Brief introduction

    CVE-2025-11683

        Missing null terminators in token.c leads to but-of-bounds read         which allows adjacent variable to be read. The issue is seen with         complex YAML files with a hash of all keys and empty values.

    CVE-2026-4177

        Several security vulnerabilities including a high-severity heap         buffer overflow in the YAML emitter. The heap overflow occurs when         class names exceed the initial 512-byte allocation. The base64         decoder could read past the buffer end on trailing newlines. strtok         mutated n->type_id in place, corrupting shared node data. A memory         leak occurred in syck_hdlr_add_anchor when a node already had an         anchor. The incoming anchor string 'a' was leaked on early return.

    For Debian 11 bullseye, these problems have been fixed in version     1.34-1+deb11u1.

    We recommend that you upgrade your libyaml-syck-perl packages.

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

    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

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 version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:1114 advisory.

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

    CVE-2026-4177:
    YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-     severity heap buffer overflow in the YAML emitter.

    The heap overflow occurs when class names exceed the initial 512-byte allocation.

    The base64 decoder could read past the buffer end on trailing newlines.

    strtok mutated n->type_id in place, corrupting shared node data.

    A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor     string 'a' was leaked on early return.

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

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

The remote Alibaba Cloud Linux 3 host has a package installed that is affected by a vulnerability as referenced in the ALINUX3-SA-2026:0073 advisory.

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

    CVE-2026-4177:
    YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-     severity heap buffer overflow in the YAML emitter.
    The heap overflow occurs when class names exceed the initial 512-byte allocation.
    The base64 decoder could read past the buffer end on trailing newlines.
    strtok mutated n->type_id in place, corrupting shared node data.
    A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor     string 'a' was leaked on early return.

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

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 perl-YAML-Syck installed on the remote host is prior to 1.27-3. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3216 advisory.

    YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-     severity heap buffer overflow in the YAML emitter.

    The heap overflow occurs when class names exceed the initial 512-byte allocation.

    The base64 decoder could read past the buffer end on trailing newlines.

    strtok mutated n->type_id in place, corrupting shared node data.

    A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor     string 'a' was leaked on early return. (CVE-2026-4177)

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

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

The remote MiracleLinux 8 host has a package installed that is affected by a vulnerability as referenced in the AXSA:2026-405:01 advisory.

    * perl-YAML-Syck: YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities     including a high-severity heap buffer overflow in the YAML emitter (CVE-2026-4177)

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

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

The remote RockyLinux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:6470 advisory.

    * perl-YAML-Syck: YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities     including a high-severity heap buffer overflow in the YAML emitter (CVE-2026-4177)

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

Note that Nessus has not tested for this issue 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
307673	Debian dla-4525 : libyaml-syck-perl - security update	Nessus	Debian Local Security Checks	2026/4/21	2026/4/21	critical
365135	TencentOS Server 3: perl-YAML-Syck (TSSA-2026:1114)	Nessus	Tencent Local Security Checks	2026/10/12	2026/10/12	high
307691	Alibaba Cloud Linux 3 : 0073: perl-YAML-Syck (ALINUX3-SA-2026:0073)	Nessus	Alibaba Cloud Linux Local Security Checks	2026/4/21	2026/4/21	critical
304600	Amazon Linux 2 : perl-YAML-Syck, --advisory ALAS2-2026-3216 (ALAS-2026-3216)	Nessus	Amazon Linux Local Security Checks	2026/4/1	2026/4/1	critical
305052	MiracleLinux 8 : perl-YAML-Syck-1.30-6.el8_10 (AXSA:2026-405:01)	Nessus	Miracle Linux Local Security Checks	2026/4/6	2026/4/6	critical
305666	RockyLinux 8 : perl-YAML-Syck (RLSA-2026:6470)	Nessus	Rocky Linux Local Security Checks	2026/4/9	2026/4/9	critical

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