{"id":"UBUNTU-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":"2026-06-12T09:04:22.658589843Z","published":"2026-06-03T01:16:00Z","upstream":["CVE-2026-9516"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-9516"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-9516"}],"affected":[{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0115-1","3.0210-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.0210-1ubuntu1","binary_name":"libcpanel-json-xs-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9516.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0225-1build1","3.0239-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpanel-json-xs-perl","binary_version":"3.0239-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9516.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12-1","4.12-1build1","4.15-1","4.17-1","4.18-1","4.19-1","4.19-1build1","4.19-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpanel-json-xs-perl","binary_version":"4.19-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9516.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.25-1build1","4.25-1build2","4.27-1","4.27-1build1","4.27-1ubuntu0.1","4.27-1ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpanel-json-xs-perl","binary_version":"4.27-1ubuntu0.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9516.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.37-1","4.37-1build1","4.37-1build2","4.37-1build3","4.37-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpanel-json-xs-perl","binary_version":"4.37-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9516.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.39-1","4.39-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpanel-json-xs-perl","binary_version":"4.39-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9516.json"}},{"package":{"name":"libcpanel-json-xs-perl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libcpanel-json-xs-perl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.39-2","4.40-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcpanel-json-xs-perl","binary_version":"4.40-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9516.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}