CVE-2026-42258Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby.
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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 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.
- CVSS
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
- Weakness (CWE)
- CWE-77, CWE-93
- 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 0.4.24; from 0.5.0 before 0.5.14; from 0.6.0 before 0.6.4 | NVD |
References
- https://github.com/ruby/net-imap/releases/tag/v0.4.24release-notes
- https://github.com/ruby/net-imap/releases/tag/v0.5.14release-notes
- https://github.com/ruby/net-imap/releases/tag/v0.6.4release-notes
- https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6pxmitigation, 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-2026:33565
- 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-2026:34076
- 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
- https://access.redhat.com/errata/RHSA-2026:36099
- https://access.redhat.com/errata/RHSA-2026:36978
- https://access.redhat.com/errata/RHSA-2026:37238
- https://access.redhat.com/errata/RHSA-2026:37397
- https://access.redhat.com/errata/RHSA-2026:38694
- https://access.redhat.com/errata/RHSA-2026:40380
- https://access.redhat.com/security/cve/CVE-2026-42258
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.