cvedb.io
CVE-2026-4177
CRITICAL · CVSS 9.1
EPSS exploitation probability: 0%
Published 2026-03-16T23:16:21.543 · Last modified 2026-06-30T03:20:31.687

Summary

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.

Affected products

toddr — yaml\

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.