{"id":"DEBIAN-CVE-2026-9516","details":"Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws.  To skip a leading 3-byte UTF-8 BOM, decode_json() advances the input scalar's string pointer past the mark with SvPV_set() and restores it only on the normal return path. When decoding aborts through a Perl exception, for example a filter_json_object callback that croaks, the restore is skipped and the scalar is left with its string pointer offset into its own buffer and a shortened length.  When that scalar is later freed, the allocator receives an invalid pointer and the interpreter aborts. A single BOM prefixed document decoded with a throwing filter callback crashes any caller.","modified":"2026-09-14T17:03:38.686393284Z","published":"2026-06-03T01:16:23.430Z","upstream":["CVE-2026-9516"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-9516"}],"affected":[{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Debian:12","purl":"pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.35-1","4.35-1+deb12u1","4.36-1","4.37-1","4.38-1","4.39-1","4.39-2","4.39-2~deb13u1","4.40-1","4.41-1","4.42-1","4.51-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9516.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Debian:13","purl":"pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.39-1","4.39-2","4.39-2~deb13u1","4.40-1","4.41-1","4.42-1","4.51-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9516.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Debian:14","purl":"pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.41-1"}]}],"versions":["4.39-1","4.39-2","4.39-2~deb13u1","4.40-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9516.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}