CVE-2026-25480Public exploitNetwork attack vector

Cache poisoning via colliding FileStore filenames

Published Feb 9, 2026 · Updated Feb 9, 2026

Cache poisoning in Litestar before 2.20.0 allows remote attackers to serve cached responses for different URLs through crafted paths. FileStore._safe_file_name() applies Unicode NFKD normalization and concatenates decimal character codes without delimiters, so distinct cache keys resolve to the same filename. Exposure requires response caching with FileStore or other attacker-influenced FileStore keys, and the mixup can disclose cached data or substitute cached content.

CVSS severity6.5
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cache poisoning in Litestar before 2.20.0 allows remote attackers to serve cached responses for different URLs through crafted paths. FileStore._safe_file_name() applies Unicode NFKD normalization and concatenates decimal character codes without delimiters, so distinct cache keys resolve to the same filename. Exposure requires response caching with FileStore or other attacker-influenced FileStore keys, and the mixup can disclose cached data or substitute cached content.

The record

CVE
CVE-2026-25480
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
Litestar
Product
Litestar
Classifications
CWE-20, CWE-176, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Litestar · Litestarversion=< 2.20.0

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-176Improper Handling of Unicode Encoding
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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