Vulnerability in Litestar
CVE-2026-25478
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Litestar
- Litestar-Org Litestar — versions < 2.20.0
Weakness classification (CWE)
References
- github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2 (Exploit, Vendor Advisory)
- github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a (Patch)
- docs.litestar.dev/2/release-notes/changelog.html (Release Notes)
- github.com/litestar-org/litestar/releases/tag/v2.20.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-25478?
- CVE-2026-25478 is a high-severity vulnerability in Litestar, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 7.4/10. Published 2026-02-09.
- How severe is CVE-2026-25478?
- High severity. CVSS v3 base score is 7.4 out of 10.