ubuntu-cve-2026-9516
Vulnerability from osv_ubuntu
Published
2026-06-03 01:16
Modified
2026-06-11 13:02
Summary
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.
Severity
7.5 (High)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcpanel-json-xs-perl",
"binary_version": "3.0210-1ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/ubuntu/libcpanel-json-xs-perl@3.0210-1ubuntu1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0115-1",
"3.0210-1ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcpanel-json-xs-perl",
"binary_version": "3.0239-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/ubuntu/libcpanel-json-xs-perl@3.0239-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0225-1build1",
"3.0239-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcpanel-json-xs-perl",
"binary_version": "4.19-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/ubuntu/libcpanel-json-xs-perl@4.19-1ubuntu0.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "4.27-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/ubuntu/libcpanel-json-xs-perl@4.27-1ubuntu0.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "4.37-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/ubuntu/libcpanel-json-xs-perl@4.37-1ubuntu0.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "4.39-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/ubuntu/libcpanel-json-xs-perl@4.39-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.39-1",
"4.39-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcpanel-json-xs-perl",
"binary_version": "4.40-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libcpanel-json-xs-perl",
"purl": "pkg:deb/ubuntu/libcpanel-json-xs-perl@4.40-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.39-2",
"4.40-1"
]
}
],
"aliases": [],
"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\u0027s 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.",
"id": "UBUNTU-CVE-2026-9516",
"modified": "2026-06-11T13:02:02Z",
"published": "2026-06-03T01:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-9516"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9516"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-9516"
]
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
Loading…
Loading…