Vulnerabilities CVE-2026-42246

CVE-2026-42246

High

Open

TLP:CLEAR

net-imap vulnerable to STARTTLS stripping via invalid response timing

NVD CVE.org

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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.

Details

CVSS Score: 7.6
EPSS Score ⓘ: 0.31%

23.7th percentile
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence: 90%
Published: May 9, 2026
Last Modified: May 9, 2026

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