CVE-2026-86141

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.

CVE-2026-86141 is fixed in libxml2 on 1 platform by DEBIAN-CVE-2026-86141 (version 2.15.4+dfsg-1), released September 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

3.3

Low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0017

5th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
libxml2 · Debian 14	2.15.4+dfsg-1	DEBIAN-CVE-2026-86141	Sep 11, 2026

Details

Published
September 5, 2026
Weakness
Unchecked Return Value
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-86141

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