PT-2026-40106 · Cpan · Yaml::Syck

Published 2026-05-12 · Updated 2026-05-23 · CVE-2026-5089

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Name of the Vulnerable Software and Affected Versions YAML::Syck versions prior to 1.38

Description An out-of-bounds read exists in the base60 (sexagesimal) parsing code within perl syck.h. Specifically, the int#base60 and float#base60 handlers contain a buffer underflow bug. When processing the leftmost segment of a colon-separated value, an inner while loop can decrement a pointer past the start of the string buffer. If no colon is found, the pointer becomes ptr-1, and the subsequent dereference reads one byte before the allocated buffer.

Recommendations Update to version 1.38 or later.

Exploit

Fix

Weakness Enumeration

CWE-124

Related Identifiers

CVE-2026-5089

OPENSUSE-SU-2026:10846-1

Affected Products

Yaml::Syck

References · 17

• 🔥 https://github.com/cpan-authors/YAML-Syck/issues/132 · Exploit
• https://github.com/cpan-authors/YAML-Syck/commit/208a4d3bd1b5cdb4a791a6e3905bd6bd45e9d005.patch · Patch
• https://cve.org/CVERecord?id=CVE-2026-5089 · Security Note
• https://ubuntu.com/security/CVE-2026-5089 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5089 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5089 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5089 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10846-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-5089 · Vendor Advisory
• https://github.com/cpan-authors/YAML-Syck/pull/133 · Note
• https://twitter.com/oss_security/status/2055156069354070184 · Twitter Post
• https://metacpan.org/release/TODDR/YAML-Syck-1.38/changes · Note
• https://suse.com/security/cve/CVE-2026-5089 · Note
• https://twitter.com/oss_security/status/2055156072151748904 · Twitter Post
• http://openwall.com/lists/oss-security/2026/05/12/16 · Note