MEDIUM6.5

PYSEC-2026-2195

Quick fix

PYSEC-2026-2195 — litestar: upgrade to the fixed version with the command below.

pip install --upgrade 'litestar>=2.20.0'

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/litestar

Introduced in: 0Fixed in: 2.20.0

Fixpip install --upgrade 'litestar>=2.20.0'

References

https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0[ADVISORY]
https://github.com/litestar-org/litestar/releases/tag/v2.20.0[ADVISORY]
https://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a[FIX]
https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2[EVIDENCE]