CVE-2026-25478
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.
Does this matter?
Lower severity and a low EPSS score (0.40%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS
- 0.40% probability · 33th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-942
- Affected
- litestar/litestar
- Source
- security-advisories@github.com
References
- https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0Release Notes
- https://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5aPatch
- https://github.com/litestar-org/litestar/releases/tag/v2.20.0Release Notes
- https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.