CVE-2026-57076 YAML::Syck versions before 1.47 for Perl allow a heap use-after-free via an anchor name reused as an anchors-table key in syck_hdlr_add_anchor

YAML::Syck versions before 1.47 for Perl allow a heap use-after-free via an anchor name reused as an anchors-table key in syckhdlraddanchor. In the bundled libsyck an anchor name allocated by syckstrndup is stored both as node-anchor, freed when the node is freed, and as the key in the parser's...

CVE-2026-57075

CVE-2026-57075 affects YAML::Syck before 1.47 for Perl. The base64 decoder syck_base64dec indexes a 256-entry table with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and causes an out-of-bounds read from the table, leading to information exposure if a crafted YA...