CVE-2026-25479: Litestar

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, in litestar.middleware.allowed_hosts, allowlist entries are compiled into regex patterns in a way that allows regex metacharacters to retain special meaning (e.g., . matches any character). This enables a bypass where an attacker supplies a host that matches the regex but is not the intended literal hostname. This vulnerability is fixed in 2.20.0.

Affected products

• Litestar Litestar: before 2.20.0 (fixed in 2.20.0)

Published 2026-02-09. Last modified 2026-06-17.