CVE-2026-42246Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.4 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-392, CWE-393, CWE-636, CWE-754, CWE-841, CWE-325
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Aug 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
ruby-lang net::imap ruby-lang:net::imap | before 0.3.10; from 0.4.0 before 0.4.24; from 0.5.0 before 0.5.14; from 0.6.0 before 0.6.4 | NVD |
References
- https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618patch
- https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485epatch
- https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42cpatch
- https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873dapatch
- https://github.com/ruby/net-imap/releases/tag/v0.3.10release-notes
- https://github.com/ruby/net-imap/releases/tag/v0.4.24release-notes
- https://github.com/ruby/net-imap/releases/tag/v0.5.14release-notes
- https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcpmitigation, vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:33462
- https://access.redhat.com/errata/RHSA-2026:33512
- https://access.redhat.com/errata/RHSA-2026:33514
- https://access.redhat.com/errata/RHSA-2026:33515
- https://access.redhat.com/errata/RHSA-2026:33540
- https://access.redhat.com/errata/RHSA-2026:33551
- https://access.redhat.com/errata/RHSA-2026:33552
- https://access.redhat.com/errata/RHSA-2026:33565
- https://access.redhat.com/errata/RHSA-2026:33576
- https://access.redhat.com/errata/RHSA-2026:33577
- https://access.redhat.com/errata/RHSA-2026:33630
- https://access.redhat.com/errata/RHSA-2026:33721
- https://access.redhat.com/errata/RHSA-2026:34076
- https://access.redhat.com/errata/RHSA-2026:35834
- https://access.redhat.com/errata/RHSA-2026:35866
- https://access.redhat.com/errata/RHSA-2026:35867
- https://access.redhat.com/errata/RHSA-2026:35895
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.