CVE-2026-42246

HIGH

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 v3.1 Score

7.4
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Published: 5/9/2026Modified: 8/24/2026

Related Intelligence (1)

CRITICALAi

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Rapid7

References (31)

https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618Patchhttps://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485ePatchhttps://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42cPatchhttps://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873daPatchhttps://github.com/ruby/net-imap/releases/tag/v0.3.10Release Noteshttps://github.com/ruby/net-imap/releases/tag/v0.4.24Release Noteshttps://github.com/ruby/net-imap/releases/tag/v0.5.14Release Noteshttps://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcpMitigationVendor Advisoryhttps://access.redhat.com/errata/RHSA-2026:33462https://access.redhat.com/errata/RHSA-2026:33512https://access.redhat.com/errata/RHSA-2026:33514https://access.redhat.com/errata/RHSA-2026:33515https://access.redhat.com/errata/RHSA-2026:33540https://access.redhat.com/errata/RHSA-2026:33551https://access.redhat.com/errata/RHSA-2026:33552https://access.redhat.com/errata/RHSA-2026:33565https://access.redhat.com/errata/RHSA-2026:33576https://access.redhat.com/errata/RHSA-2026:33577https://access.redhat.com/errata/RHSA-2026:33630https://access.redhat.com/errata/RHSA-2026:33721https://access.redhat.com/errata/RHSA-2026:34076https://access.redhat.com/errata/RHSA-2026:35834https://access.redhat.com/errata/RHSA-2026:35866https://access.redhat.com/errata/RHSA-2026:35867https://access.redhat.com/errata/RHSA-2026:35895https://access.redhat.com/errata/RHSA-2026:36099https://access.redhat.com/errata/RHSA-2026:37238https://access.redhat.com/errata/RHSA-2026:37397https://access.redhat.com/security/cve/CVE-2026-42246https://bugzilla.redhat.com/show_bug.cgi?id=2468499https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42246.json