High 7.4Published Feb 9, 2026

CVE-2026-25478Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins

Updated under an hour ago (Oct 27, 2026, 5:23 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Weakness (CWE): CWE-942
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Feb 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

litestar-org litestar litestar_org:litestar (from the name)	before 2.20.0	CNA record
litestar litestar litestar:litestar	before 2.20.0	NVD

References

References

https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2	x-refsource-confirm, exploit, vendor-advisory
https://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a	x-refsource-misc, patch
https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0	x-refsource-misc, release-notes
https://github.com/litestar-org/litestar/releases/tag/v2.20.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.