Vulnerability Details CVE-2026-42258
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.008
EPSS Ranking 53.0%
CVSS Severity
CVSS v3 Score 5.3
References
- https://github.com/ruby/net-imap/releases/tag/v0.4.24
- https://github.com/ruby/net-imap/releases/tag/v0.5.14
- https://github.com/ruby/net-imap/releases/tag/v0.6.4
- https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px
- 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-2026:37238
- https://access.redhat.com/errata/RHSA-2026:37397
- https://access.redhat.com/security/cve/CVE-2026-42258
- https://bugzilla.redhat.com/show_bug.cgi?id=2468498
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42258.json