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7.4highHigh

CVE-2026-42246

Ruby-Lang Net\

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.

Exploitation status

  • A vendor advisory or patch reference has been published.

What the metrics mean

  • It is reachable over a network, without needing local access.
  • For an attacker who can reach it, exploitation depends on conditions outside the attacker's control.
  • To exploit it, no account is needed.
  • Beyond that, no action by a user is required.

Scoring

CVSS
7.4 (v3.1)
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4
7.6
Weakness
CWE-392
Assigned by
security-advisories@github.com

Dates

Published
2026-05-09
Last modified
2026-08-24
Sources
NVD

Affected products

  • Ruby-Lang Net\- 0.3.10, 0.4.0 - 0.4.24, 0.5.0 - 0.5.14, 0.6.0 - 0.6.4

As listed in the NVD configuration data. Not a statement about your estate.

References