CVE-2026-86144 Server-side request forgery in libxml2
Attackers can trigger SSRF or DoS via XInclude processing in libxml2 due to missing parse flag propagation, affecting applications using the library.
- 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-2026-86144?
CVE-2026-86144 is a medium-severity server-side request forgery 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 xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do not propagate parseFlags. This has security relevance for, for example, the XML_PARSE_NONET flag, if (without it) a custom resource loader accesses the internet and triggers XML external entity injection, SSRF, or a denial of service (e.g., for an attacker-controlled internet resource that is intentionally slow).
Weakness: CWE-669
Which versions are affected by CVE-2026-86144?
It affects 1 product.
Products include Xmlsoft Libxml2.
How do I fix CVE-2026-86144?
Upgrade to a fixed version.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-86144 being exploited?
There is no known exploitation of CVE-2026-86144 in the wild and no public exploit code.
Other vulnerabilities in Xmlsoft Libxml2
Sources
Also known as AZL-99702, BELL-CVE-2026-86144, DEBIAN-CVE-2026-86144, ECHO-0085-7842-c8d6, GHSA-h6w8-m27h-f268, ROOT-OS-DEBIAN-12-CVE-2026-86144 and 1 more.