CVE Watch15 jul 2026

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#

CVSS

7.5

Alto

EPSS

0.5%

p38

KEV

—

Exploit Today

0-100

Publicado: 2 abr 2026 · Última mod.: 15 jul 2026 · CWE-400 · CWE-407 · CWE-770

EPSS · 30d

0.5%EPSS · 30 días0.5%

2026-06-302026-07-16

Descripción técnica

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.

Referencias oficiales

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