DEBIAN-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. 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.
DEBIAN-CVE-2026-9516
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-9516
libcpanel-json-xs-perl
Source reference: /affected/0/package/name
- Affected versions
- 4.35-1
Source reference:
/affected/0/versions4.35-1+deb12u1Source reference:
/affected/0/versions4.36-1Source reference:
/affected/0/versions4.37-1Source reference:
/affected/0/versions4.38-1Source reference:
/affected/0/versions4.39-1Source reference:
/affected/0/versions4.39-2Source reference:
/affected/0/versions4.39-2~deb13u1Source reference:
/affected/0/versions4.40-1Source reference:
/affected/0/versions4.41-1Source reference:
/affected/0/versions4.42-1Source reference:
/affected/0/versions4.51-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libcpanel-json-xs-perl
Source reference: /affected/1/package/name
- Affected versions
- 4.39-1
Source reference:
/affected/1/versions4.39-2Source reference:
/affected/1/versions4.39-2~deb13u1Source reference:
/affected/1/versions4.40-1Source reference:
/affected/1/versions4.41-1Source reference:
/affected/1/versions4.42-1Source reference:
/affected/1/versions4.51-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libcpanel-json-xs-perl
Source reference: /affected/2/package/name
- Affected versions
- 4.39-1
Source reference:
/affected/2/versions4.39-2Source reference:
/affected/2/versions4.39-2~deb13u1Source reference:
/affected/2/versions4.40-1Source reference:
/affected/2/versions - Fixed versions
- 4.41-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=bookworm",
"ecosystem": "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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9516.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=trixie",
"ecosystem": "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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9516.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.41-1"
}
]
}
],
"package": {
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/debian/libcpanel-json-xs-perl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.39-1",
"4.39-2",
"4.39-2~deb13u1",
"4.40-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9516.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58420 · Revision 1
- Added to Heist Feed
- Publisher date