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

Quick assessment

Affected
litestar-org litestar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Litestar是Litestar开源的一个强大、灵活但固执己见的 ASGI 框架。 Litestar 2.20.0之前版本存在安全漏洞，该漏洞源于缓存键映射方式存在键冲突，可能导致缓存投毒或混淆。

CVSS 6.5 · Medium EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-25480

Vulnerability Information
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Vulnerability Title
FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord + Unicode NFKD)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
Unicode编码处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Litestar 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Litestar是Litestar开源的一个强大、灵活但固执己见的 ASGI 框架。 Litestar 2.20.0之前版本存在安全漏洞，该漏洞源于缓存键映射方式存在键冲突，可能导致缓存投毒或混淆。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
litestar-org litestar < 2.20.0 -

II. Public POCs for CVE-2026-25480

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III. Intelligence Information for CVE-2026-25480

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Other References for CVE-2026-25480 (1)

Same Patch Batch · litestar-org · 2026-02-09 · 3 CVEs total

CVE-2026-25478 7.4 HIGH Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allow
CVE-2026-25479 6.5 MEDIUM Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in co

IV. Related Vulnerabilities

Same product: litestar
Same vendor: litestar-org
Same weakness: CWE-176

V. Comments for CVE-2026-25480

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