CVE-2025-49794: libxml2 Expired Pointer Dereference
Vulnerability summary
CVE-2025-49794 is a critical (CVSS 9.1) Expired Pointer Dereference vulnerability in libxml2. EPSS estimates a 0.83% chance of exploitation in the next 30 days, higher than 56.9% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 23 · Related 9Timeline
- 16-06-2025PublishedVulnerability first disclosed.
- 12-10-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · AlpineEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- NVDNIST9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS trend
Probability
0.83%
Chance of exploitation in the next 30 days
Percentile
57%
Versus all other CVEs
30-day change
0.00 pp
From 0.83% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- libxml2< 2.13.9-r0
Debian1 product
- libxml2< 2.9.14+dfsg-1.3~deb12u3 | < 2.12.7+dfsg+really2.9.14-2
Ubuntu1 product
- libxml2< 2.9.1+dfsg1-3ubuntu4.13+esm8 | < 2.9.3+dfsg1-1ubuntu0.7+esm9 | < 2.9.4+dfsg1-6.1ubuntu1.9+esm4 | < 2.9.10+dfsg-5ubuntu0.20.04.10+esm1 | < 2.9.13+dfsg-1ubuntu0.8 | < 2.9.14+dfsg-1.3ubuntu3.4
3 vendors · 3 products
