CVE-2026-86137

Publication date 5 September 2026

Last updated 8 October 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

2.9 · Low

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
libxml2 26.04 LTS resolute
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

charlescochran

The vulnerable NXT lookahead in xmlFAParsePosCharGroup was added in 2.15.3 (d1bccc48), which affects none of our releases.

Patch details

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

Package Patch details
libxml2

Severity score breakdown

CVSS version: CVSS v3.0

Base score 2.9 · Low

Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Other references

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