CVE-2026-42258

Description

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42258.json

https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px

https://github.com/ruby/net-imap/releases/tag/v0.6.4

https://github.com/ruby/net-imap/releases/tag/v0.5.14

https://github.com/ruby/net-imap/releases/tag/v0.4.24

https://bugzilla.redhat.com/show_bug.cgi?id=2468498

https://access.redhat.com/security/cve/CVE-2026-42258

https://access.redhat.com/errata/RHSA-2026:37397

https://access.redhat.com/errata/RHSA-2026:37238

https://access.redhat.com/errata/RHSA-2026:36978

https://access.redhat.com/errata/RHSA-2026:36099

https://access.redhat.com/errata/RHSA-2026:35895

https://access.redhat.com/errata/RHSA-2026:35867

https://access.redhat.com/errata/RHSA-2026:35866

https://access.redhat.com/errata/RHSA-2026:35834

https://access.redhat.com/errata/RHSA-2026:35447

https://access.redhat.com/errata/RHSA-2026:34076

https://access.redhat.com/errata/RHSA-2026:33630

https://access.redhat.com/errata/RHSA-2026:33577

https://access.redhat.com/errata/RHSA-2026:33576

https://access.redhat.com/errata/RHSA-2026:33565

https://access.redhat.com/errata/RHSA-2026:33540

https://access.redhat.com/errata/RHSA-2026:33515

https://access.redhat.com/errata/RHSA-2026:33514

https://access.redhat.com/errata/RHSA-2026:33512

https://access.redhat.com/errata/RHSA-2026:33462

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS