CVE-2025-6442

webrick: Ruby WEBrick Request Smuggling Vulnerability

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Severity

Moderate

Red Hat Product Security

6.5

CVSS 3.0

Review impact separately from score.

Published · June 26, 2025

Updated · August 31, 2026

Description

A request smuggling vulnerability has been discovered in the Ruby WEBrick gem. This vulnerability is exploitable when the product is deployed behind a HTTP proxy that fulfills specific conditions.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS / CWE

CVSS 3.0 · 6.5
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')