CVE-2026-25479 — Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in configured host patterns
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 …
Published: 2026-02-09 · CVSS: 6.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7