Vulnerability in Litestar
CVE-2026-25480
Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, FileStore maps cache keys to filenames using Unicode NFKD normalization and ord() substitution without separators, creating key collisions. When FileStore is used as response-cache backend, an unauthenticated remote attacker can trigger cache key collisions via crafted paths, causing one URL to serve cached responses of another (cache poisoning/mixup). This vulnerability is fixed in 2.20.0.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (45.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.9% 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: 0.006 · 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-vxqx-rh46-q2pg (Exploit, Vendor Advisory)
- github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2cca (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-2026-25480?
- CVE-2026-25480 is a medium-severity vulnerability in Litestar, classified under CWE-176. CVSS score: 6.5/10. Published 2026-02-09.
- How severe is CVE-2026-25480?
- Medium severity. CVSS v3 base score is 6.5 out of 10.