Buffer Underwrite (Buffer Underflow) Affecting cpan-authors/YAML-Syck package, versions [,1.38)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-CPANAUTHORSYAMLSYCK-16669630
- published14 May 2026
- disclosed12 May 2026
- creditUnknown
Introduced: 12 May 2026
CVE-2026-5089 (opens in a new tab)How to fix?
Upgrade cpan-authors/YAML-Syck to version 1.38 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Underwrite (Buffer Underflow) in the base60 parsing process in perl_syck.h. An attacker can trigger a buffer underflow and cause an out-of-bounds read by supplying specially crafted colon-separated values, which may lead to reading memory outside the allocated buffer.