CVE-2026-42246

HIGH EPSS 33.8%
Published May 9, 20261mo ago · Modified Jun 17, 20262w ago
7.6 CVSS 4.0
High
Find Similar
Published May 9, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.6
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
33.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 5

CWE-392
CWE-393
CWE-636
CWE-754
CWE-841

Affected Products 4

VendorProductVersionRange
ruby-langnet\\ <0.3.10
ruby-langnet\\≥0.4.0  –  <0.4.24
ruby-langnet\\≥0.5.0  –  <0.5.14
ruby-langnet\\≥0.6.0  –  <0.6.4

References 8

  • github.com https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618
    Patch
  • github.com https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e
    Patch
  • github.com https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c
    Patch
  • github.com https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da
    Patch
  • github.com https://github.com/ruby/net-imap/releases/tag/v0.3.10
    Release Notes
  • github.com https://github.com/ruby/net-imap/releases/tag/v0.4.24
    Release Notes
  • github.com https://github.com/ruby/net-imap/releases/tag/v0.5.14
    Release Notes
  • github.com https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp
    MitigationVendor Advisory

Remediation

  • github.com https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618
    Patch
  • github.com https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e
    Patch
  • github.com https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c
    Patch
  • github.com https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da
    Patch