High severityNVD Advisory· Published Feb 9, 2026· Updated Feb 10, 2026
Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins
CVE-2026-25478
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
litestarPyPI | >= 2.19.0, < 2.20.0 | 2.20.0 |
Affected products
2- Range: < 2.20.0
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-2p2x-hpg8-cqp2ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-25478ghsaADVISORY
- docs.litestar.dev/2/release-notes/changelog.htmlghsax_refsource_MISCWEB
- github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5aghsax_refsource_MISCWEB
- github.com/litestar-org/litestar/releases/tag/v2.20.0ghsax_refsource_MISCWEB
- github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2ghsax_refsource_CONFIRMWEB
News mentions
0No linked articles in our index yet.