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CVE-2026-25480

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 · EPSS 0.5% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • litestar

    Versions
    • < 2.20.0: Affected

    No fix published

  • litestar PyPI

    Versions
    • 2.19.0
    Affected ranges
    • ECOSYSTEM: ≥ 2.19.0, < 2.20.0

    Update to 2.20.0

  • litestar PyPI

    Versions
    • 1.0.0a0
    • 2.0.0
    • 2.0.0a3
    • 2.0.0a4
    • 2.0.0a5
    • 2.0.0a6
    • 2.0.0a7
    • 2.0.0b1
    • 2.0.0b2
    • 2.0.0b3
    • 2.0.0b4
    • 2.0.0rc1
    • 2.0.1
    • 2.1.0
    • 2.1.1
    • 2.10.0
    • 2.11.0
    • 2.12.0
    • 2.12.1
    • 2.13.0
    • 2.14.0
    • 2.15.0
    • 2.15.1
    • 2.15.2
    • 2.16.0
    • 2.17.0
    • 2.18.0
    • 2.19.0
    • 2.2.0
    • 2.2.1
    • 2.3.0
    • 2.3.1
    • 2.3.2
    • 2.4.0
    • 2.4.1
    • 2.4.2
    • 2.4.3
    • 2.4.4
    • 2.4.5
    • 2.5.0
    • 2.5.1
    • 2.5.2
    • 2.5.3
    • 2.5.4
    • 2.5.5
    • 2.6.0
    • 2.6.1
    • 2.6.2
    • 2.6.3
    • 2.6.4
    • 2.7.0
    • 2.7.1
    • 2.7.2
    • 2.8.0
    • 2.8.1
    • 2.8.2
    • 2.8.3
    • 2.9.0
    • 2.9.1
    Affected ranges
    • ECOSYSTEM: < 2.20.0

    Update to 2.20.0

Original sources

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