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Vulnerability Details CVE-2026-34827

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21, and 3.2.0 to before 3.2.6, Rack::Multipart::Parser#handle_mime_head parses quoted multipart parameters such as Content-Disposition: form-data; name="..." using repeated String#index searches combined with String#slice! prefix deletion. For escape-heavy quoted values, this causes super-linear processing. An unauthenticated attacker can send a crafted multipart/form-data request containing many parts with long backslash-escaped parameter values to trigger excessive CPU usage during multipart parsing. This results in a denial of service condition in Rack applications that accept multipart form data. This issue has been patched in versions 3.1.21 and 3.2.6.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.4%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-34827
  • 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


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