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CVE Watch24 jul 2026

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

CVSS

4.8

Medio

EPSS

0.1%

p4

KEV

—

Exploit Today

1

0-100

Publicado: 2 abr 2026 · Última mod.: 24 jul 2026 · CWE-130 · CWE-135

EPSS · 30d

0.1%EPSS · 30 días0.2%

2026-09-302026-10-28

Descripción técnica

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.

Referencias oficiales

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

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