CVE-2026-125110
Rack: Rack::Static header_rules bypass via dot-segment normalization mismatch
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
Rack 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.
| CWE | CWE-180 |
| Vendor | rack |
| Product | rack |
| Published | Nov 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
rack / rack
< 2.2.25 >= 3.0, < 3.1.23 >= 3.2, < 3.2.8
References
github.com: https://github.com/rack/rack/security/advisories/GHSA-wvg4-6p58-3gh3 github.com: https://github.com/rack/rack/commit/18a07fe553afb4d8a678d6a948cd6ba1e11e28be github.com: https://github.com/rack/rack/commit/9d7f19484ffd5ed5e032678c26ee6eff96d3a0a3 github.com: https://github.com/rack/rack/commit/e88097ccb88be44d06d47b42daffe04929516ee4