Detections
Analytics
CVE-2026-4177
high
Description
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.
References
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4177.json
https://metacpan.org/release/TODDR/YAML-Syck-1.37_01/changes#L21
https://github.com/cpan-authors/YAML-Syck/commit/e8844a31c8cf0052914b198fc784ed4e6b8ae69e.patch
https://bugzilla.redhat.com/show_bug.cgi?id=2448277
https://access.redhat.com/security/cve/CVE-2026-4177
https://access.redhat.com/errata/RHSA-2026:8311