CVE-2026-25478: 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, CORSConfig.allowed_origins_regex is constructed using a regex built from configured allowlist values and used with fullmatch() for validation. Because metacharacters are not escaped, a malicious origin can match unexpectedly. The check relies on allowed_origins_regex.fullmatch(origin). 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.