CVE-2026-25478

Name: CVE-2026-25478
Creator: NVD / NIST
Published: 2026-02-09T20:15:57.017+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.38%

Last modified Jun 17, 2026

CVE-2026-25478 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.38%

30.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-942

Affected Software

Vendor	Product	Versions
Litestar	Litestar	< 2.20.0

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

Timeline

Published: Feb 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-25478?

How severe is CVE-2026-25478?

CVE-2026-25478 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2026-25478?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-25478?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST