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CVE-2026-57076 is a heap use-after-free vulnerability in YAML::Syck for Perl, affecting versions before 1.47, in the bundled libsyck parser code. The flaw is in syck_hdlr_add_anchor, where an anchor name allocated with syck_strndup is stored both in node->anchor and as the key in the parser's anchors table. Because the node owns and frees node->anchor during node destruction, the anchors table is left holding a dangling pointer to freed memory. When the same anchor is later redefined, table deletion and comparison logic dereference that stale key, causing st_delete and st_strcmp to read freed heap memory. The vulnerable path is reachable through the default YAML::Syck Load and LoadFile parsing path because YAML anchors are a standard language feature and do not require special flags.
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Cross-references every affected SKU, including bundled OEM variants.
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