Rack: Rack::Static header_rules bypass via dot-segment normalization mismatch

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-125110
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-09 22:18:42 UTC
Updated2026-11-12 19:18:09 UTC
DescriptionRack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Static serves a path after Utils.clean_path_info normalization but evaluates header_rules against a path that is only URL-decoded. An unauthenticated attacker can request a known file through raw or percent-encoded dot segments and receive it without path-specific security headers such as Content-Disposition or Content-Security-Policy. Applications that do not use path-specific header_rules are not affected. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

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

EPSS: 0.002510000 probability, percentile 0.165910000 (date 2026-11-12)

Problem Types: CWE-180 | CWE-180 CWE-180: Incorrect Behavior Order: Validate Before Canonicalize

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rack Rack affected < 2.2.25 Not specified
CNA Rack Rack affected >= 3.0, < 3.1.23 Not specified
CNA Rack Rack affected >= 3.2, < 3.2.8 Not specified

References

ReferenceSourceLinkTags
github.com/rack/rack/commit/18a07fe553afb4d8a678d6a948cd6ba1e11e28be [email protected] github.com
github.com/rack/rack/commit/9d7f19484ffd5ed5e032678c26ee6eff96d3a0a3 [email protected] github.com
github.com/rack/rack/commit/e88097ccb88be44d06d47b42daffe04929516ee4 [email protected] github.com
github.com/rack/rack/security/advisories/GHSA-wvg4-6p58-3gh3 [email protected] github.com
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