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CVE-2026-42246

HIGH CVSS: 7.4 Published: 2026-05-09 Modified: 2026-08-05

Description

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4.

Affected Platforms

Ruby-Lang Net\

Weakness Type

CWE-392, CWE-393, CWE-636, CWE-754, CWE-841, CWE-325

References