CVE-2025-49794

Publication date 16 June 2025

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libxml2	25.04 plucky	Fixed 2.12.7+dfsg+really2.9.14-0.4ubuntu0.2
	24.10 oracular	Ignored end of life, was needs-triage
	24.04 LTS noble	Fixed 2.9.14+dfsg-1.3ubuntu3.4
	22.04 LTS jammy	Fixed 2.9.13+dfsg-1ubuntu0.8
	20.04 LTS focal	Fixed 2.9.10+dfsg-5ubuntu0.20.04.10+esm1
	18.04 LTS bionic	Fixed 2.9.4+dfsg1-6.1ubuntu1.9+esm4
	16.04 LTS xenial	Fixed 2.9.3+dfsg1-1ubuntu0.7+esm9
	14.04 LTS trusty	Fixed 2.9.1+dfsg1-3ubuntu4.13+esm8

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Patch details

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

Package	Patch details
libxml2	Upstream: 81cef8c

Severity score breakdown

Parameter	Value
Base score	9.1 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-7694-1
libxml2 vulnerabilities
14 August 2025