YAML::Syck versions before 1.38 for Perl has an out-of-bounds read. The base60 (sexagesimal) parsing code in perl_syck.h has a buffer underflow bug in both int#base60 and float#base60 handlers. When processing the leftmost segment of a colon-separated value (e.g., the 1 in 1:30:45), the inner while loop can decrement a pointer past the start of the string buffer: while ( colon >= ptr && *colon != ':' ) { colon--; } if ( *colon == ':' ) *colon = '\0'; // colon may be ptr-1 here When no colon is found (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon dereference reads one byte before the allocated buffer.

The remote Debian 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6428 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6428-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     August 10, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : libyaml-syck-perl     CVE ID         : CVE-2026-5089 CVE-2026-13713 CVE-2026-57075 CVE-2026-57076                      CVE-2026-57077     Debian Bug     : 1142267

    Several vulnerabilities were discovered in libyaml-syck-perl, a Perl     module providing a fast, lightweight YAML loader and dumper, which could     result in denial of service and potentially arbitrary code execution.

    For the stable distribution (trixie), these problems have been fixed in     version 1.34-2+deb13u3.

    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 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 Debian 11 / 12 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4730 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4730-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                 Salvatore Bonaccorso     August 10, 2026                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : libyaml-syck-perl     Version        : 1.34-1+deb11u2 1.34-2+deb12u3     CVE ID         : CVE-2026-5089 CVE-2026-13713 CVE-2026-57075 CVE-2026-57076                      CVE-2026-57077     Debian Bug     : 1142267

    Several vulnerabilities were discovered in libyaml-syck-perl, a Perl     module providing a fast, lightweight YAML loader and dumper, which could     result in denial of service and potentially arbitrary code execution.

    For Debian 11 bullseye, these problems have been fixed in version     1.34-1+deb11u2.

    For Debian 12 bookworm, these problems have been fixed in version     1.34-2+deb12u3.

    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 remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:20938-1 advisory.

    Changes in perl-YAML-Syck:

    - CVE-2026-5089: prevent buffer underflow in base60 (sexagesimal) parsing (PR #133) (bsc#1265155).

Tenable has extracted the preceding description block directly from the SUSE 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 ALAS2-2026-3327 advisory.

    YAML::Syck versions before 1.38 for Perl  has an out-of-bounds read.

    The base60 (sexagesimal) parsing code in perl_syck.h has a buffer underflow bug in both int#base60 and     float#base60 handlers. When processing the leftmost segment of a colon-separated value (e.g., the 1 in     1:30:45), the inner while loop can decrement a pointer past the start of the string buffer:

    while ( colon >= ptr && *colon != ':' ){colon--;}if ( *colon == ':' ) *colon = '\0';  // colon may be     ptr-1 here

    When no colon is found (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon     dereference reads one byte before the allocated buffer. (CVE-2026-5089)

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.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1769 advisory.

    YAML::Syck versions before 1.38 for Perl  has an out-of-bounds read.

    The base60 (sexagesimal) parsing code in perl_syck.h has a buffer underflow bug in both int#base60 and     float#base60 handlers. When processing the leftmost segment of a colon-separated value (e.g., the 1 in     1:30:45), the inner while loop can decrement a pointer past the start of the string buffer:

    while ( colon >= ptr && *colon != ':' ){colon--;}if ( *colon == ':' ) *colon = '\0';  // colon may be     ptr-1 here

    When no colon is found (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon     dereference reads one byte before the allocated buffer. (CVE-2026-5089)

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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - YAML::Syck versions before 1.38 for Perl has an out-of-bounds read. The base60 (sexagesimal) parsing code     in perl_syck.h has a buffer underflow bug in both int#base60 and float#base60 handlers. When processing     the leftmost segment of a colon-separated value (e.g., the 1 in 1:30:45), the inner while loop can     decrement a pointer past the start of the string buffer: while ( colon >= ptr && *colon != ':' ) {     colon--; } if ( *colon == ':' ) *colon = '\0'; // colon may be ptr-1 here When no colon is found     (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon dereference reads one byte before     the allocated buffer. (CVE-2026-5089)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
334412	Debian dsa-6428 : libyaml-syck-perl - security update	Nessus	Debian Local Security Checks	critical
334411	Debian dla-4730 : libyaml-syck-perl - security update	Nessus	Debian Local Security Checks	critical
321002	openSUSE 16 Security Update : perl-YAML-Syck (openSUSE-SU-2026:20938-1)	Nessus	SuSE Local Security Checks	high
319855	Amazon Linux 2 : perl-YAML-Syck, --advisory ALAS2-2026-3327 (ALAS-2026-3327)	Nessus	Amazon Linux Local Security Checks	high
319805	Amazon Linux 2023 : perl-YAML-Syck, perl-YAML-Syck-tests (ALAS2023-2026-1769)	Nessus	Amazon Linux Local Security Checks	high
315674	Linux Distros Unpatched Vulnerability : CVE-2026-5089	Nessus	Misc.	high

Detections

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CVE-2026-5089

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Tenable Plugins

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high