CVE-2026-25478 — Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins
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 allow…
Published: 2026-02-09 · CVSS: 7.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7