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CVE-2026-125110

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

publishedCWE-180

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.

Technical severity5.3 mediumCVSS 3.1 · CNA: GitHub_M
Published2026-11-09Source updated 2026-11-14
Collected2026-11-144 attributed sources

Fixes and workarounds

Fix

rack (RubyGems): OSV reports a fixed version 2.2.25. Check the advisory for supported release branches.

Source: OSV GHSA-wvg4-6p58-3gh3

Fix

rack (RubyGems): OSV reports a fixed version 3.1.23. Check the advisory for supported release branches.

Source: OSV GHSA-wvg4-6p58-3gh3

Fix

rack (RubyGems): OSV reports a fixed version 3.2.8. Check the advisory for supported release branches.

Source: OSV GHSA-wvg4-6p58-3gh3

Affected products and versions

ProductVersionsAuthority
rack
rack 		< 2.2.25 (affected)
>= 3.0, < 3.1.23 (affected)
>= 3.2, < 3.2.8 (affected) 		CNA: GitHub_M
rack

rack
RubyGems 		0.1.0 (affected, RubyGems)
0.2.0 (affected, RubyGems)
0.3.0 (affected, RubyGems)
0.4.0 (affected, RubyGems)
0.9.0 (affected, RubyGems)
0.9.1 (affected, RubyGems)
1.0.0 (affected, RubyGems)
1.0.1 (affected, RubyGems)
1.1.0 (affected, RubyGems)
1.1.1 (affected, RubyGems)
1.1.1.pre (affected, RubyGems)
1.1.2 (affected, RubyGems)
1.1.3 (affected, RubyGems)
1.1.4 (affected, RubyGems)
1.1.5 (affected, RubyGems)
1.1.6 (affected, RubyGems)
1.2.0 (affected, RubyGems)
1.2.1 (affected, RubyGems)
1.2.2 (affected, RubyGems)
1.2.3 (affected, RubyGems)
1.2.4 (affected, RubyGems)
1.2.5 (affected, RubyGems)
1.2.6 (affected, RubyGems)
1.2.7 (affected, RubyGems)
1.2.8 (affected, RubyGems)
1.3.0 (affected, RubyGems)
1.3.0.beta (affected, RubyGems)
1.3.0.beta2 (affected, RubyGems)
1.3.1 (affected, RubyGems)
1.3.10 (affected, RubyGems)
1.3.2 (affected, RubyGems)
1.3.3 (affected, RubyGems)
1.3.4 (affected, RubyGems)
1.3.5 (affected, RubyGems)
1.3.6 (affected, RubyGems)
1.3.7 (affected, RubyGems)
1.3.8 (affected, RubyGems)
1.3.9 (affected, RubyGems)
1.4.0 (affected, RubyGems)
1.4.1 (affected, RubyGems)
1.4.2 (affected, RubyGems)
1.4.3 (affected, RubyGems)
1.4.4 (affected, RubyGems)
1.4.5 (affected, RubyGems)
1.4.6 (affected, RubyGems)
1.4.7 (affected, RubyGems)
1.5.0 (affected, RubyGems)
1.5.0.beta.1 (affected, RubyGems)
1.5.0.beta.2 (affected, RubyGems)
1.5.1 (affected, RubyGems)
1.5.2 (affected, RubyGems)
1.5.3 (affected, RubyGems)
1.5.4 (affected, RubyGems)
1.5.5 (affected, RubyGems)
1.6.0 (affected, RubyGems)
1.6.0.beta (affected, RubyGems)
1.6.0.beta2 (affected, RubyGems)
1.6.1 (affected, RubyGems)
1.6.10 (affected, RubyGems)
1.6.11 (affected, RubyGems)
1.6.12 (affected, RubyGems)
1.6.13 (affected, RubyGems)
1.6.2 (affected, RubyGems)
1.6.3 (affected, RubyGems)
1.6.4 (affected, RubyGems)
1.6.5 (affected, RubyGems)
1.6.6 (affected, RubyGems)
1.6.7 (affected, RubyGems)
1.6.8 (affected, RubyGems)
1.6.9 (affected, RubyGems)
2.0.0.alpha (affected, RubyGems)
2.0.0.rc1 (affected, RubyGems)
2.0.1 (affected, RubyGems)
2.0.2 (affected, RubyGems)
2.0.3 (affected, RubyGems)
2.0.4 (affected, RubyGems)
2.0.5 (affected, RubyGems)
2.0.6 (affected, RubyGems)
2.0.7 (affected, RubyGems)
2.0.8 (affected, RubyGems)
2.0.9 (affected, RubyGems)
2.0.9.1 (affected, RubyGems)
2.0.9.2 (affected, RubyGems)
2.0.9.3 (affected, RubyGems)
2.0.9.4 (affected, RubyGems)
2.1.0 (affected, RubyGems)
2.1.1 (affected, RubyGems)
2.1.2 (affected, RubyGems)
2.1.3 (affected, RubyGems)
2.1.4 (affected, RubyGems)
2.1.4.1 (affected, RubyGems)
2.1.4.2 (affected, RubyGems)
2.1.4.3 (affected, RubyGems)
2.1.4.4 (affected, RubyGems)
2.2.0 (affected, RubyGems)
2.2.1 (affected, RubyGems)
2.2.10 (affected, RubyGems)
2.2.11 (affected, RubyGems)
2.2.12 (affected, RubyGems)
2.2.13 (affected, RubyGems)
2.2.14 (affected, RubyGems)
2.2.15 (affected, RubyGems)
2.2.16 (affected, RubyGems)
2.2.17 (affected, RubyGems)
2.2.18 (affected, RubyGems)
2.2.19 (affected, RubyGems)
2.2.2 (affected, RubyGems)
2.2.20 (affected, RubyGems)
2.2.21 (affected, RubyGems)
2.2.22 (affected, RubyGems)
2.2.23 (affected, RubyGems)
2.2.24 (affected, RubyGems)
2.2.3 (affected, RubyGems)
2.2.3.1 (affected, RubyGems)
2.2.4 (affected, RubyGems)
2.2.5 (affected, RubyGems)
2.2.6 (affected, RubyGems)
2.2.6.1 (affected, RubyGems)
2.2.6.2 (affected, RubyGems)
2.2.6.3 (affected, RubyGems)
2.2.6.4 (affected, RubyGems)
2.2.7 (affected, RubyGems)
2.2.8 (affected, RubyGems)
2.2.8.1 (affected, RubyGems)
2.2.9 (affected, RubyGems)
Ecosystem version events: introduced 0; fixed 2.2.25
Source events (ECOSYSTEM) 
[
  {
    "introduced": "0"
  },
  {
    "fixed": "2.2.25"
  }
]

Other versions: unaffected 		OSV GHSA-wvg4-6p58-3gh3
rack

rack
RubyGems 		3.0.0 (affected, RubyGems)
3.0.1 (affected, RubyGems)
3.0.10 (affected, RubyGems)
3.0.11 (affected, RubyGems)
3.0.12 (affected, RubyGems)
3.0.13 (affected, RubyGems)
3.0.14 (affected, RubyGems)
3.0.15 (affected, RubyGems)
3.0.16 (affected, RubyGems)
3.0.17 (affected, RubyGems)
3.0.18 (affected, RubyGems)
3.0.2 (affected, RubyGems)
3.0.3 (affected, RubyGems)
3.0.4 (affected, RubyGems)
3.0.4.1 (affected, RubyGems)
3.0.4.2 (affected, RubyGems)
3.0.5 (affected, RubyGems)
3.0.6 (affected, RubyGems)
3.0.6.1 (affected, RubyGems)
3.0.7 (affected, RubyGems)
3.0.8 (affected, RubyGems)
3.0.9 (affected, RubyGems)
3.0.9.1 (affected, RubyGems)
3.1.0 (affected, RubyGems)
3.1.1 (affected, RubyGems)
3.1.10 (affected, RubyGems)
3.1.11 (affected, RubyGems)
3.1.12 (affected, RubyGems)
3.1.13 (affected, RubyGems)
3.1.14 (affected, RubyGems)
3.1.15 (affected, RubyGems)
3.1.16 (affected, RubyGems)
3.1.17 (affected, RubyGems)
3.1.18 (affected, RubyGems)
3.1.19 (affected, RubyGems)
3.1.2 (affected, RubyGems)
3.1.20 (affected, RubyGems)
3.1.21 (affected, RubyGems)
3.1.22 (affected, RubyGems)
3.1.3 (affected, RubyGems)
3.1.4 (affected, RubyGems)
3.1.5 (affected, RubyGems)
3.1.6 (affected, RubyGems)
3.1.7 (affected, RubyGems)
3.1.8 (affected, RubyGems)
3.1.9 (affected, RubyGems)
Ecosystem version events: introduced 3.0.0; fixed 3.1.23
Source events (ECOSYSTEM) 
[
  {
    "introduced": "3.0.0"
  },
  {
    "fixed": "3.1.23"
  }
]

Other versions: unaffected 		OSV GHSA-wvg4-6p58-3gh3
rack

rack
RubyGems 		3.2.0 (affected, RubyGems)
3.2.1 (affected, RubyGems)
3.2.2 (affected, RubyGems)
3.2.3 (affected, RubyGems)
3.2.4 (affected, RubyGems)
3.2.5 (affected, RubyGems)
3.2.6 (affected, RubyGems)
3.2.7 (affected, RubyGems)
Ecosystem version events: introduced 3.2.0; fixed 3.2.8
Source events (ECOSYSTEM) 
[
  {
    "introduced": "3.2.0"
  },
  {
    "fixed": "3.2.8"
  }
]

Other versions: unaffected 		OSV GHSA-wvg4-6p58-3gh3

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
3.1 / 5.3
medium		 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NCNA: GitHub_M
3.1 / 5.3
medium		 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NNVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

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