CVE-2026-42246highCWE-325 CWE-392 CWE-393 CWE-636 CWE-754 CWE-841

net-imap vulnerable to STARTTLS stripping via invalid response timing

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.6epss 0.3%

exploitation probability

0.3%top 76% of all CVEs

observed exploitation

nono source reports it

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.

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

Affected products

ruby · net-imap

References