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CVE-2026-25480

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Date: February 9, 2026

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.

Severity Score

Severity Score

Weakness Type (CWE)

Improper Input Validation

CWE-20

Improper Handling of Unicode Encoding

CWE-176

Top Fix

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Upgrade Version

Upgrade to version litestar - 2.20.0;https://github.com/litestar-org/litestar.git - v2.20.0;https://github.com/litestar-org/litestar.git - v2.20.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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