{"id":"AZL-92904","summary":"CVE-2026-13713 affecting package perl-YAML-Syck 1.34-1","details":"YAML::Syck versions before 1.47 for Perl allow a use-after-free and double-free via an anchor node freed while still on the parser value stack.\n\nIn the bundled libsyck, when an anchor name is redefined or removed, syck_hdlr_add_anchor and syck_hdlr_remove_anchor free the node stored under that name with syck_free_node. That node can still be live on the parser's value stack, so syck_hdlr_add_node reaches it again and frees it a second time. On a normal build the 48-byte node chunk is freed twice and the interpreter aborts. Anchors need no special flags, so this is reached on the default Load path, and a 7-byte document that redefines an anchor triggers it.\n\nAny caller that runs Load or LoadFile on an untrusted document that redefines an anchor mid-parse crashes the interpreter, a denial of service.","modified":"2026-08-30T05:24:52Z","published":"2026-07-16T22:16:59Z","upstream":["CVE-2026-13713"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13713"}],"affected":[{"package":{"name":"perl-YAML-Syck","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/perl-YAML-Syck"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.34-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-92904.json"}}],"schema_version":"1.9.0"}