CRLF Injection Affecting ruby3.4-rubygems package, versions <0:3.6.9-27.amzn2023.0.6


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.41% (33rd percentile)

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  • Snyk IDSNYK-AMZN2023-RUBY34RUBYGEMS-17290408
  • published10 Jun 2026
  • disclosed9 May 2026

Introduced: 9 May 2026

CVE-2026-42257  (opens in a new tab)
CWE-93  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 ruby3.4-rubygems to version 0:3.6.9-27.amzn2023.0.6 or higher.
This issue was patched in ALAS2023-2026-1807.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby3.4-rubygems package and not the ruby3.4-rubygems package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain CRLF sequences, which an attacker can use to inject arbitrary IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

CVSS Base Scores

version 3.1