High7.4Red Hat Linux

High [CVE-2026-42246] Net::IMAP: Information disclosure via man-in-the-middle attack bypassing TLS

This high-severity Red Hat Linux advisory covers CVE-2026-42246 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support.

CVE-2026-42246 Published May 9, 2026

CVE-2026-42246

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

Net::IMAP: Information disclosure via man-in-the-middle attack bypassing TLS. Red Hat rates this important (CVSS 7.4).

Weakness: CWE-325. Affected package(s): ruby, ruby4, ruby4.0, ruby:3.3, ruby3, ruby:2.5.

Resolved in Red Hat advisory RHSA-2026:33514 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 9 more.

Affected versions

ruby-0:3.0.7-162.el9_4.3
ruby4-0-main-4.0.0-33.4.hum1
ruby-0:3.0.7-167.el9_8
ruby4.0-0:4.0.3-35.el10_2
ruby:3.3-8100020260615131010.489197e6
ruby-0:3.0.4-161.el9_2.3
ruby-0:3.3.10-13.el10_2
ruby-0:3.0.7-165.el9_6.1
ruby3-3-main-3.3.10-23.2.hum1
ruby3-4-main-3.4.8-31.2.hum1
ruby:3.3-9080020260615131001.9
ruby:2.5-8080020260625114827.63b34585

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:33514

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:33514 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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