CVE-2026-25478
Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins
- State
- Published
- Severity
- 7.4 High
- Published
- Feb 9, 2026
- Updated
- Feb 10, 2026
- Reserved
- Feb 2, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.4 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N | GitHub_M |
Weaknesses
- CWE-942 Permissive Cross-domain Policy with Untrusted Domains
Affected Products
| Product | Versions |
|---|---|
litestarlitestar-org |
|
References
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