Vulnerability · Published Sep 5, 2026 · Assigned by mitre
CVE-2026-86137
Low 2.9
In plain English
A low-severity out-of-bounds read in libxml2 from xmlsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)2.9Low
Exploit odds (30 days)0.2%top 90.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In libxml2 before 2.15.4, xmlFAParsePosCharGroup has an out-of-bounds read, aka an out-of-bounds read in the NXT macro in xmlregexp.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | libxml2 | no fix listed | DEBIAN-CVE-2026-86137 |
| Debian:14 | libxml2 | 2.15.4+dfsg-1 | DEBIAN-CVE-2026-86137 |
| Ubuntu:22.04:LTS | libxml2 | no fix listed | UBUNTU-CVE-2026-86137 |
| Ubuntu:24.04:LTS | libxml2 | no fix listed | UBUNTU-CVE-2026-86137 |
| Ubuntu:26.04:LTS | libxml2 | no fix listed | UBUNTU-CVE-2026-86137 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L