Reliance on Cookies without Validation and Integrity Checking Affecting ruby4.0 package, versions <0:4.0.0-33.3.hum1


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.76% (74th percentile)

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  • Snyk IDSNYK-RHEL10-RUBY40-16079915
  • published16 Apr 2026
  • disclosed24 Nov 2021

Introduced: 24 Nov 2021

CVE-2021-41819  (opens in a new tab)
CWE-565  (opens in a new tab)

How to fix?

Upgrade RHEL:10 ruby4.0 to version 0:4.0.0-33.3.hum1 or higher.
This issue was patched in RHSA-2026:8838.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby4.0 package and not the ruby4.0 package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.

CVSS Base Scores

version 3.1