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Vulnerable Software

Vulnerability Details CVE-2026-34831

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Files#fail sets the Content-Length response header using String#size instead of String#bytesize. When the response body contains multibyte UTF-8 characters, the declared Content-Length is smaller than the number of bytes actually sent on the wire. Because Rack::Files reflects the requested path in 404 responses, an attacker can trigger this mismatch by requesting a non-existent path containing percent-encoded UTF-8 characters. This results in incorrect HTTP response framing and may cause response desynchronization in deployments that rely on the incorrect Content-Length value. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 11.3%

CVSS Severity

CVSS v3 Score 4.8

References

https://github.com/rack/rack/security/advisories/GHSA-q2ww-5357-x388

Products affected by CVE-2026-34831

Rack » Rack » Version: 0.1

cpe:2.3:a:rack:rack:0.1
Rack » Rack » Version: 0.2

cpe:2.3:a:rack:rack:0.2
Rack » Rack » Version: 0.3

cpe:2.3:a:rack:rack:0.3
Rack » Rack » Version: 0.4

cpe:2.3:a:rack:rack:0.4
Rack » Rack » Version: 0.9

cpe:2.3:a:rack:rack:0.9
Rack » Rack » Version: 0.9.1

cpe:2.3:a:rack:rack:0.9.1
Rack » Rack » Version: 1.0

cpe:2.3:a:rack:rack:1.0
Rack » Rack » Version: 1.0.1

cpe:2.3:a:rack:rack:1.0.1
Rack » Rack » Version: 1.1

cpe:2.3:a:rack:rack:1.1
Rack » Rack » Version: 1.1.2

cpe:2.3:a:rack:rack:1.1.2
Rack » Rack » Version: 1.1.3

cpe:2.3:a:rack:rack:1.1.3
Rack » Rack » Version: 1.1.4

cpe:2.3:a:rack:rack:1.1.4
Rack » Rack » Version: 1.1.5

cpe:2.3:a:rack:rack:1.1.5
Rack » Rack » Version: 1.1.6

cpe:2.3:a:rack:rack:1.1.6
Rack » Rack » Version: 1.2

cpe:2.3:a:rack:rack:1.2
Rack » Rack » Version: 1.2.1

cpe:2.3:a:rack:rack:1.2.1
Rack » Rack » Version: 1.2.2

cpe:2.3:a:rack:rack:1.2.2
Rack » Rack » Version: 1.2.3

cpe:2.3:a:rack:rack:1.2.3
Rack » Rack » Version: 1.2.4

cpe:2.3:a:rack:rack:1.2.4
Rack » Rack » Version: 1.2.5

cpe:2.3:a:rack:rack:1.2.5
Rack » Rack » Version: 1.2.6

cpe:2.3:a:rack:rack:1.2.6
Rack » Rack » Version: 1.2.7

cpe:2.3:a:rack:rack:1.2.7
Rack » Rack » Version: 1.2.8

cpe:2.3:a:rack:rack:1.2.8
Rack » Rack » Version: 1.3.0

cpe:2.3:a:rack:rack:1.3.0
Rack » Rack » Version: 1.3.1

cpe:2.3:a:rack:rack:1.3.1
Rack » Rack » Version: 1.3.10

cpe:2.3:a:rack:rack:1.3.10
Rack » Rack » Version: 1.3.2

cpe:2.3:a:rack:rack:1.3.2
Rack » Rack » Version: 1.3.3

cpe:2.3:a:rack:rack:1.3.3
Rack » Rack » Version: 1.3.4

cpe:2.3:a:rack:rack:1.3.4
Rack » Rack » Version: 1.3.5

cpe:2.3:a:rack:rack:1.3.5
Rack » Rack » Version: 1.3.6

cpe:2.3:a:rack:rack:1.3.6
Rack » Rack » Version: 1.3.7

cpe:2.3:a:rack:rack:1.3.7
Rack » Rack » Version: 1.3.8

cpe:2.3:a:rack:rack:1.3.8
Rack » Rack » Version: 1.3.9

cpe:2.3:a:rack:rack:1.3.9
Rack » Rack » Version: 1.4.0

cpe:2.3:a:rack:rack:1.4.0
Rack » Rack » Version: 1.4.1

cpe:2.3:a:rack:rack:1.4.1
Rack » Rack » Version: 1.4.2

cpe:2.3:a:rack:rack:1.4.2
Rack » Rack » Version: 1.4.3

cpe:2.3:a:rack:rack:1.4.3
Rack » Rack » Version: 1.4.4

cpe:2.3:a:rack:rack:1.4.4
Rack » Rack » Version: 1.4.5

cpe:2.3:a:rack:rack:1.4.5
Rack » Rack » Version: 1.4.6

cpe:2.3:a:rack:rack:1.4.6
Rack » Rack » Version: 1.4.7

cpe:2.3:a:rack:rack:1.4.7
Rack » Rack » Version: 1.5.0

cpe:2.3:a:rack:rack:1.5.0
Rack » Rack » Version: 1.5.1

cpe:2.3:a:rack:rack:1.5.1
Rack » Rack » Version: 1.5.2

cpe:2.3:a:rack:rack:1.5.2
Rack » Rack » Version: 1.5.3

cpe:2.3:a:rack:rack:1.5.3
Rack » Rack » Version: 1.5.4

cpe:2.3:a:rack:rack:1.5.4
Rack » Rack » Version: 1.5.5

cpe:2.3:a:rack:rack:1.5.5
Rack » Rack » Version: 1.6.0

cpe:2.3:a:rack:rack:1.6.0
Rack » Rack » Version: 1.6.1

cpe:2.3:a:rack:rack:1.6.1
Rack » Rack » Version: 1.6.10

cpe:2.3:a:rack:rack:1.6.10
Rack » Rack » Version: 1.6.11

cpe:2.3:a:rack:rack:1.6.11
Rack » Rack » Version: 1.6.12

cpe:2.3:a:rack:rack:1.6.12
Rack » Rack » Version: 1.6.13

cpe:2.3:a:rack:rack:1.6.13
Rack » Rack » Version: 1.6.2

cpe:2.3:a:rack:rack:1.6.2
Rack » Rack » Version: 1.6.3

cpe:2.3:a:rack:rack:1.6.3
Rack » Rack » Version: 1.6.4

cpe:2.3:a:rack:rack:1.6.4
Rack » Rack » Version: 1.6.5

cpe:2.3:a:rack:rack:1.6.5
Rack » Rack » Version: 1.6.6

cpe:2.3:a:rack:rack:1.6.6
Rack » Rack » Version: 1.6.7

cpe:2.3:a:rack:rack:1.6.7
Rack » Rack » Version: 1.6.8

cpe:2.3:a:rack:rack:1.6.8
Rack » Rack » Version: 1.6.9

cpe:2.3:a:rack:rack:1.6.9
Rack » Rack » Version: 2.0.0

cpe:2.3:a:rack:rack:2.0.0
Rack » Rack » Version: 2.0.1

cpe:2.3:a:rack:rack:2.0.1
Rack » Rack » Version: 2.0.2

cpe:2.3:a:rack:rack:2.0.2
Rack » Rack » Version: 2.0.3

cpe:2.3:a:rack:rack:2.0.3
Rack » Rack » Version: 2.0.4

cpe:2.3:a:rack:rack:2.0.4
Rack » Rack » Version: 2.0.5

cpe:2.3:a:rack:rack:2.0.5
Rack » Rack » Version: 2.0.6

cpe:2.3:a:rack:rack:2.0.6
Rack » Rack » Version: 2.0.7

cpe:2.3:a:rack:rack:2.0.7
Rack » Rack » Version: 2.0.8

cpe:2.3:a:rack:rack:2.0.8
Rack » Rack » Version: 2.0.9

cpe:2.3:a:rack:rack:2.0.9
Rack » Rack » Version: 2.0.9.2

cpe:2.3:a:rack:rack:2.0.9.2
Rack » Rack » Version: 2.0.9.3

cpe:2.3:a:rack:rack:2.0.9.3
Rack » Rack » Version: 2.1.0

cpe:2.3:a:rack:rack:2.1.0
Rack » Rack » Version: 2.1.1

cpe:2.3:a:rack:rack:2.1.1
Rack » Rack » Version: 2.1.2

cpe:2.3:a:rack:rack:2.1.2
Rack » Rack » Version: 2.1.3

cpe:2.3:a:rack:rack:2.1.3
Rack » Rack » Version: 2.1.4

cpe:2.3:a:rack:rack:2.1.4
Rack » Rack » Version: 2.1.4.2

cpe:2.3:a:rack:rack:2.1.4.2
Rack » Rack » Version: 2.1.4.3

cpe:2.3:a:rack:rack:2.1.4.3
Rack » Rack » Version: 2.2.0

cpe:2.3:a:rack:rack:2.2.0
Rack » Rack » Version: 2.2.1

cpe:2.3:a:rack:rack:2.2.1
Rack » Rack » Version: 2.2.10

cpe:2.3:a:rack:rack:2.2.10
Rack » Rack » Version: 2.2.11

cpe:2.3:a:rack:rack:2.2.11
Rack » Rack » Version: 2.2.12

cpe:2.3:a:rack:rack:2.2.12
Rack » Rack » Version: 2.2.13

cpe:2.3:a:rack:rack:2.2.13
Rack » Rack » Version: 2.2.14

cpe:2.3:a:rack:rack:2.2.14
Rack » Rack » Version: 2.2.15

cpe:2.3:a:rack:rack:2.2.15
Rack » Rack » Version: 2.2.16

cpe:2.3:a:rack:rack:2.2.16
Rack » Rack » Version: 2.2.17

cpe:2.3:a:rack:rack:2.2.17
Rack » Rack » Version: 2.2.18

cpe:2.3:a:rack:rack:2.2.18
Rack » Rack » Version: 2.2.19

cpe:2.3:a:rack:rack:2.2.19
Rack » Rack » Version: 2.2.2

cpe:2.3:a:rack:rack:2.2.2
Rack » Rack » Version: 2.2.20

cpe:2.3:a:rack:rack:2.2.20
Rack » Rack » Version: 2.2.3

cpe:2.3:a:rack:rack:2.2.3
Rack » Rack » Version: 2.2.4

cpe:2.3:a:rack:rack:2.2.4
Rack » Rack » Version: 2.2.4.1

cpe:2.3:a:rack:rack:2.2.4.1
Rack » Rack » Version: 2.2.5

cpe:2.3:a:rack:rack:2.2.5
Rack » Rack » Version: 2.2.6

cpe:2.3:a:rack:rack:2.2.6
Rack » Rack » Version: 2.2.6.1

cpe:2.3:a:rack:rack:2.2.6.1
Rack » Rack » Version: 2.2.6.2

cpe:2.3:a:rack:rack:2.2.6.2
Rack » Rack » Version: 2.2.6.3

cpe:2.3:a:rack:rack:2.2.6.3
Rack » Rack » Version: 2.2.6.4

cpe:2.3:a:rack:rack:2.2.6.4
Rack » Rack » Version: 2.2.7

cpe:2.3:a:rack:rack:2.2.7
Rack » Rack » Version: 2.2.8

cpe:2.3:a:rack:rack:2.2.8
Rack » Rack » Version: 2.2.8.1

cpe:2.3:a:rack:rack:2.2.8.1
Rack » Rack » Version: 2.2.9

cpe:2.3:a:rack:rack:2.2.9
Rack » Rack » Version: 3.0.0

cpe:2.3:a:rack:rack:3.0.0
Rack » Rack » Version: 3.0.1

cpe:2.3:a:rack:rack:3.0.1
Rack » Rack » Version: 3.0.10

cpe:2.3:a:rack:rack:3.0.10
Rack » Rack » Version: 3.0.12

cpe:2.3:a:rack:rack:3.0.12
Rack » Rack » Version: 3.0.13

cpe:2.3:a:rack:rack:3.0.13
Rack » Rack » Version: 3.0.14

cpe:2.3:a:rack:rack:3.0.14
Rack » Rack » Version: 3.0.15

cpe:2.3:a:rack:rack:3.0.15
Rack » Rack » Version: 3.0.16

cpe:2.3:a:rack:rack:3.0.16
Rack » Rack » Version: 3.0.17

cpe:2.3:a:rack:rack:3.0.17
Rack » Rack » Version: 3.0.18

cpe:2.3:a:rack:rack:3.0.18
Rack » Rack » Version: 3.0.2

cpe:2.3:a:rack:rack:3.0.2
Rack » Rack » Version: 3.0.3

cpe:2.3:a:rack:rack:3.0.3
Rack » Rack » Version: 3.0.4

cpe:2.3:a:rack:rack:3.0.4
Rack » Rack » Version: 3.0.4.1

cpe:2.3:a:rack:rack:3.0.4.1
Rack » Rack » Version: 3.0.4.2

cpe:2.3:a:rack:rack:3.0.4.2
Rack » Rack » Version: 3.0.5

cpe:2.3:a:rack:rack:3.0.5
Rack » Rack » Version: 3.0.6

cpe:2.3:a:rack:rack:3.0.6
Rack » Rack » Version: 3.0.6.1

cpe:2.3:a:rack:rack:3.0.6.1
Rack » Rack » Version: 3.0.7

cpe:2.3:a:rack:rack:3.0.7
Rack » Rack » Version: 3.0.8

cpe:2.3:a:rack:rack:3.0.8
Rack » Rack » Version: 3.0.9

cpe:2.3:a:rack:rack:3.0.9
Rack » Rack » Version: 3.0.9.1

cpe:2.3:a:rack:rack:3.0.9.1
Rack » Rack » Version: 3.1.0

cpe:2.3:a:rack:rack:3.1.0
Rack » Rack » Version: 3.1.1

cpe:2.3:a:rack:rack:3.1.1
Rack » Rack » Version: 3.1.10

cpe:2.3:a:rack:rack:3.1.10
Rack » Rack » Version: 3.1.11

cpe:2.3:a:rack:rack:3.1.11
Rack » Rack » Version: 3.1.12

cpe:2.3:a:rack:rack:3.1.12
Rack » Rack » Version: 3.1.13

cpe:2.3:a:rack:rack:3.1.13
Rack » Rack » Version: 3.1.14

cpe:2.3:a:rack:rack:3.1.14
Rack » Rack » Version: 3.1.15

cpe:2.3:a:rack:rack:3.1.15
Rack » Rack » Version: 3.1.16

cpe:2.3:a:rack:rack:3.1.16
Rack » Rack » Version: 3.1.17

cpe:2.3:a:rack:rack:3.1.17
Rack » Rack » Version: 3.1.18

cpe:2.3:a:rack:rack:3.1.18
Rack » Rack » Version: 3.1.2

cpe:2.3:a:rack:rack:3.1.2
Rack » Rack » Version: 3.1.3

cpe:2.3:a:rack:rack:3.1.3
Rack » Rack » Version: 3.1.4

cpe:2.3:a:rack:rack:3.1.4
Rack » Rack » Version: 3.1.5

cpe:2.3:a:rack:rack:3.1.5
Rack » Rack » Version: 3.1.6

cpe:2.3:a:rack:rack:3.1.6
Rack » Rack » Version: 3.1.7

cpe:2.3:a:rack:rack:3.1.7
Rack » Rack » Version: 3.1.8

cpe:2.3:a:rack:rack:3.1.8
Rack » Rack » Version: 3.1.9

cpe:2.3:a:rack:rack:3.1.9
Rack » Rack » Version: 3.2.0

cpe:2.3:a:rack:rack:3.2.0
Rack » Rack » Version: 3.2.1

cpe:2.3:a:rack:rack:3.2.1
Rack » Rack » Version: 3.2.2

cpe:2.3:a:rack:rack:3.2.2
Rack » Rack » Version: 3.2.3

cpe:2.3:a:rack:rack:3.2.3

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-34831

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