CVE-2026-9516
CVE-2026-9516 · 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
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.5 · High · EPSS 0.6% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
cpanel::json::xs
- Versions
- ≥ 0, < 4.41: Affected (custom)
Update to 4.41
libcpanel-json-xs-perl Debian:12
- 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
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Debian:13
- Versions
- 4.39-1
- 4.39-2
- 4.39-2~deb13u1
- 4.40-1
- 4.41-1
- 4.42-1
- 4.51-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Debian:14
- Versions
- 4.39-1
- 4.39-2
- 4.39-2~deb13u1
- 4.40-1
- Affected ranges
- ECOSYSTEM: < 4.41-1
Update to 4.41-1
libcpanel-json-xs-perl Ubuntu:16.04:LTS
- Versions
- 3.0115-1
- 3.0210-1ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Ubuntu:18.04:LTS
- Versions
- 3.0225-1build1
- 3.0239-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Ubuntu:20.04:LTS
- 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
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Ubuntu:22.04:LTS
- Versions
- 4.25-1build1
- 4.25-1build2
- 4.27-1
- 4.27-1build1
- 4.27-1ubuntu0.1
- 4.27-1ubuntu0.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Ubuntu:24.04:LTS
- Versions
- 4.37-1
- 4.37-1build1
- 4.37-1build2
- 4.37-1build3
- 4.37-1ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Ubuntu:25.10
- Versions
- 4.39-1
- 4.39-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Ubuntu:26.10
- Versions
- 4.40-1
- 4.42-1
- 4.42-1build1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libcpanel-json-xs-perl Ubuntu:26.04:LTS
- Versions
- 4.39-2
- 4.40-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published