CVE-2026-86144: Xmlsoft LIBXML2

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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).

Affected products

• Xmlsoft LIBXML2: before 2.15.4 (fixed in 2.15.4)

Published 2026-09-05. Last modified 2026-09-15.