CVE-2026-86141

Publication date 5 September 2026

Last updated 8 October 2026

Ubuntu priority

Cvss 3 Severity Score

Description

xmlregexp in libxml2 before 2.15.4 has a NULL pointer dereference in xmlRegNewParserCtxt after a strdup failure, i.e., it does not calculate a string length after NULL checking.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libxml2	26.04 LTS resolute	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

charlescochran

The strlen() on the xmlStrdup() result was added by the upstream fix for CVE-2026-86137 (76fe08d9, 2.15.4). None of our releases need that fix, meaning that this CVE also affects none of our releases.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libxml2	Upstream: e89a8aa

Severity score breakdown

CVSS version: CVSS v3.0

Base score 2.9 · Low

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	Low

Scores

Parameter	Value
Base score	2.9 · Low
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L