Detections
Analytics
CVE-2026-25479
medium
Description
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.
References
https://github.com/litestar-org/litestar/security/advisories/GHSA-93ph-p7v4-hwh4
https://github.com/litestar-org/litestar/releases/tag/v2.20.0
https://github.com/litestar-org/litestar/commit/06b36f481d1bfea6f19995cfb4f203aba45c4ace
https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0