CVE-2026-86137 Memory corruption in libxml2
An out-of-bounds read in libxml2 allows attackers to cause denial of service or disclose sensitive memory contents via crafted XML input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-86137?
CVE-2026-86137 is a low-severity memory corruption vulnerability in Xmlsoft Libxml2, published on 5 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-86137?
It affects 1 product.
Products include Xmlsoft Libxml2.
How do I fix CVE-2026-86137?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-86137 being exploited?
There is no known exploitation of CVE-2026-86137 in the wild and no public exploit code.
Other vulnerabilities in Xmlsoft Libxml2
Sources
Also known as AZL-99723, DEBIAN-CVE-2026-86137, ECHO-0081-3031-f882, GHSA-cq7w-3xjv-g47g.