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CVE-2026-5089

7.3 · HIGH

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

Published May 12, 2026CWE-124EPSS 0.42%

Overview

CVE-2026-5089 is a high-severity vulnerability. It was published on May 12, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cpan-authors/YAML-Syck/commit/208a4d3bd1b5cdb4a791a6e3905bd6bd45e9d005.patchGitHubgithub.com/cpan-authors/YAML-Syck/issues/132GitHubgithub.com/cpan-authors/YAML-Syck/pull/133Refmetacpan.org/release/TODDR/YAML-Syck-1.38/changesRefwww.openwall.com/lists/oss-security/2026/05/12/16GitHubgithub.com/cpan-authors/YAML-Syck/issues/132

How CyberStrike helps

Frequently asked questions

What is CVE-2026-5089?

CVE-2026-5089 is a high-severity vulnerability. It was published on May 12, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-5089?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-5089?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-5089?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-5089 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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