CVE-2026-25480

Summary

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.

Affected Software

Weaknesses

• CWE-176: CWE-176: Improper Handling of Unicode Encoding

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/litestar-org/litestar/security/advisories/GHSA-vxqx-rh46-q2pg
• https://github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2cca
• https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0
• https://github.com/litestar-org/litestar/releases/tag/v2.20.0

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