FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord + Unicode NFKD)
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.4%
exploitation probability
0.4%top 63% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Affected products
litestar-org · litestarReferences
https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0https://github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2ccahttps://github.com/litestar-org/litestar/releases/tag/v2.20.0https://github.com/litestar-org/litestar/security/advisories/GHSA-vxqx-rh46-q2pg