Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Litestar | Litestar | < 2.20.0 |
Related Weaknesses (CWE)
References
- https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0Release Notes
- https://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e7Patch
- https://github.com/litestar-org/litestar/releases/tag/v2.20.0Release Notes
- https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2ExploitVendor Advisory
FAQ
What is CVE-2026-25478?
CVE-2026-25478 is a vulnerability with a CVSS score of 7.4 (HIGH). 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 wi...
How severe is CVE-2026-25478?
CVE-2026-25478 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25478?
Check the references section above for vendor advisories and patch information. Affected products include: Litestar Litestar.