Moderate severityNVD Advisory· Published Feb 9, 2026· Updated Feb 10, 2026
FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord + Unicode NFKD)
CVE-2026-25480
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
litestarPyPI | >= 2.19.0, < 2.20.0 | 2.20.0 |
Affected products
2- Range: < 2.20.0
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-vxqx-rh46-q2pgghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-25480ghsaADVISORY
- docs.litestar.dev/2/release-notes/changelog.htmlghsax_refsource_MISCWEB
- github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2ccaghsax_refsource_MISCWEB
- github.com/litestar-org/litestar/releases/tag/v2.20.0ghsax_refsource_MISCWEB
- github.com/litestar-org/litestar/security/advisories/GHSA-vxqx-rh46-q2pgghsax_refsource_CONFIRMWEB
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