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CVE-2026-57076 is a heap use-after-free vulnerability in YAML::Syck for Perl before version 1.47, in the bundled libsyck anchor-handling code. In syck_hdlr_add_anchor, an anchor name allocated by syck_strndup is assigned both to node->anchor and as a key in the parser's anchors table. When the node is freed, its anchor string is freed even though the anchors table retains the same pointer. A later redefinition of that anchor causes the table deletion and comparison logic to dereference the dangling key, reading freed heap memory. The corrected implementation gives the anchors and bad_anchors tables independent ownership of their key strings.
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A vulnerability affecting the FreeBSD p5-yaml-syck (YAML-Syck) package. The supplied content does not describe the specific flaw.
A YAML::Syck/libsyck heap use-after-free caused by an anchor name being shared between a node and the parser anchors-table key. Redefining an anchor in an untrusted document can cause comparison against freed heap memory through the default Load or LoadFile path.
A use-after-free vulnerability in libsyck involving an anchor key string shared between a node and the anchors table, reachable through default YAML::Syck::Load() processing of untrusted input.
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