CVE-2025-12863

Libxml2: namespace use-after-free in xmlsettreedoc() function of libxml2

CVE-2025-12863 is fixed in libxml2 on 1 platform by DEBIAN-CVE-2025-12863 (version 2.15.1+dfsg-0.4), released November 7, 2025. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.5
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
n/a

A flaw was found in the xmlSetTreeDoc() function of the libxml2 XML parsing library. This function is responsible for updating document pointers when XML nodes are moved between documents. Due to improper handling of namespace references, a namespace pointer may remain linked to a freed memory region when the original document is destroyed. As a result, subsequent operations that access the namespace can lead to a use-after-free condition, causing an application crash.

Where it's fixed

ProductFixed inFixReleased
Linux
libxml2 · Debian 14 2.15.1+dfsg-0.4 DEBIAN-CVE-2025-12863 Nov 7, 2025

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