CVE-2026-25478
HIGHLitestar < 2.20.0 - Permissive Cross-domain Security Policy via Unescaped Regex Metacharacters
Title source: llmDescription
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)
Core 4
Core References
Exploit, Vendor Advisory x_refsource_confirm
https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2
Patch x_refsource_misc
https://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a
Release Notes x_refsource_misc
https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0
Release Notes x_refsource_misc
https://github.com/litestar-org/litestar/releases/tag/v2.20.0
Scores
CVSS v3
7.4
EPSS
0.0038
EPSS Percentile
29.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-942
Status
published
Products (2)
litestar/litestar
< 2.20.0
pypi/litestar
2.19.0 - 2.20.0PyPI
Published
Feb 09, 2026
Tracked Since
Feb 18, 2026