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Vulnerability Details :

CVE-2026-25480

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-09 Feb, 2026 | 18:49
Updated At-10 Feb, 2026 | 16:01
Rejected At-
Credits

FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord + Unicode NFKD)

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:09 Feb, 2026 | 18:49
Updated At:10 Feb, 2026 | 16:01
Rejected At:
▼CVE Numbering Authority (CNA)
FileStore key canonicalization collisions allow response cache mixup/poisoning (ASCII ord + Unicode NFKD)

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 Products
Vendor
litestar-org
Product
litestar
Versions
Affected
  • < 2.20.0
Problem Types
TypeCWE IDDescription
CWECWE-176CWE-176: Improper Handling of Unicode Encoding
Type: CWE
CWE ID: CWE-176
Description: CWE-176: Improper Handling of Unicode Encoding
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/litestar-org/litestar/security/advisories/GHSA-vxqx-rh46-q2pg
x_refsource_CONFIRM
https://github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2cca
x_refsource_MISC
https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0
x_refsource_MISC
https://github.com/litestar-org/litestar/releases/tag/v2.20.0
x_refsource_MISC
Hyperlink: https://github.com/litestar-org/litestar/security/advisories/GHSA-vxqx-rh46-q2pg
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2cca
Resource:
x_refsource_MISC
Hyperlink: https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0
Resource:
x_refsource_MISC
Hyperlink: https://github.com/litestar-org/litestar/releases/tag/v2.20.0
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:09 Feb, 2026 | 20:15
Updated At:09 Feb, 2026 | 21:55

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-176Primarysecurity-advisories@github.com
CWE ID: CWE-176
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0security-advisories@github.com
N/A
https://github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2ccasecurity-advisories@github.com
N/A
https://github.com/litestar-org/litestar/releases/tag/v2.20.0security-advisories@github.com
N/A
https://github.com/litestar-org/litestar/security/advisories/GHSA-vxqx-rh46-q2pgsecurity-advisories@github.com
N/A
Hyperlink: https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/litestar-org/litestar/commit/85db6183a76f8a6b3fd6ee3c88d860b9f37a2cca
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/litestar-org/litestar/releases/tag/v2.20.0
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/litestar-org/litestar/security/advisories/GHSA-vxqx-rh46-q2pg
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

Similar CVEs

1Records found
CVE-2026-25479
Matching Score-8
Assigner-GitHub, Inc.
ShareView Details
Matching Score-8
Assigner-GitHub, Inc.
CVSS Score-6.5||MEDIUM
EPSS-0.04% / 11.18%
||
7 Day CHG~0.00%
Published-09 Feb, 2026 | 18:48
Updated-10 Feb, 2026 | 16:01
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Litestar has an AllowedHosts validation bypass due to unescaped regex metacharacters in configured host patterns

Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, in litestar.middleware.allowed_hosts, allowlist entries are compiled into regex patterns in a way that allows regex metacharacters to retain special meaning (e.g., . matches any character). This enables a bypass where an attacker supplies a host that matches the regex but is not the intended literal hostname. This vulnerability is fixed in 2.20.0.

Action-Not Available
Vendor-litestar-org
Product-litestar
CWE ID-CWE-185
Incorrect Regular Expression
Details not found