Threats Tagged 'cve-2026-4177'

CVE-2026-4177 is a critical heap-based buffer overflow vulnerability in YAML::Syck versions through 1.36 for Perl. The flaw occurs when class names exceed the initial 512-byte allocation in the YAML emitter. Additional issues include a base64 decoder reading past buffer ends on trailing newlines, corruption of shared node data due to strtok mutating type IDs, and a memory leak when adding anchors to nodes that already have one. Red Hat has issued security advisories and updates addressing these vulnerabilities.

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.