CVE-2026-25478

HIGH

Pypi Litestar < 2.20.0 - Permissive CORS Policy

Title source: rule

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.

References (4)

[Release Notes] https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0

[Patch] https://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a

View Patch ZIP pw:eip

[Release Notes] https://github.com/litestar-org/litestar/releases/tag/v2.20.0

[Exploit, Vendor Advisory] https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2

Scores

CVSS v3 7.4

EPSS 0.0001

EPSS Percentile 1.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Classification

CWE

CWE-942

Status published

Affected Products (2)

litestar/litestar < 2.20.0

pypi/litestar < 2.20.0PyPI

Timeline

Published Feb 09, 2026

Tracked Since Feb 18, 2026