CVE-2025-49796: libxml2 Out-of-bounds Read
Vulnerability summary
CVE-2025-49796 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in libxml2. EPSS estimates a 1.56% chance of exploitation in the next 30 days, higher than 74.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 23 · Related 9Timeline
- 16-06-2025PublishedVulnerability first disclosed.
- 08-10-2026Last modifiedVulnerability information updated.
Description
A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to sensitive data being corrupted in memory.
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
1.56%
Chance of exploitation in the next 30 days
Percentile
75%
Versus all other CVEs
30-day change
0.00 pp
From 1.56% on 18-09-2026
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
