CVE-2026-34827: falha de alta gravidade em rack
Rack: Algorithmic-Complexity DoS in Rack::Multipart::Parser
Publicada em · Atualizada em
Aviso por e-mail quando ela entrar no KEV, ganhar PoC pública ou subir de nota.
21Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 7.5epss 0.5%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Produtos afetados
rack · rackCVEs relacionadas — rack
No mesmo produto, das mais perigosas para as menos.
CVE-2024-25126MEDIUMRack ReDos in content type parsing (2nd degree polynomial)EPSS 35.4%CVE-2019-16782MEDIUMPossible Information Leak / Session Hijack Vulnerability in RackEPSS 3.7%CVE-2024-26146MEDIUMPossible Denial of Service Vulnerability in Rack Header ParsingEPSS 2.0%CVE-2024-26141MEDIUMPossible DoS Vulnerability with Range Header in RackEPSS 1.6%CVE-2025-46727HIGHUnbounded-Parameter DoS in Rack::QueryParserEPSS 1.2%CVE-2025-25184MEDIUMPossible Log Injection in Rack::CommonLoggerEPSS 1.2%