Medium 6.5Published Feb 9, 2026

CVE-2026-25480FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord + Unicode NFKD)

Updated under an hour ago (Oct 27, 2026, 4:30 PM ET)

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It affects litestar-org litestar and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-176
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-vxqx-rh46-q2pg	x-refsource-confirm, exploit, vendor-advisory
https://github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2cca	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.