CVE-2026-42258

MEDIUM

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 v3.1 Score

5.3
MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
LOW
Published: 5/9/2026Modified: 8/24/2026

Related Intelligence (1)

CRITICALAi

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References (27)

https://github.com/ruby/net-imap/releases/tag/v0.4.24Release Noteshttps://github.com/ruby/net-imap/releases/tag/v0.5.14Release Noteshttps://github.com/ruby/net-imap/releases/tag/v0.6.4Release Noteshttps://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6pxMitigationVendor Advisoryhttps://access.redhat.com/errata/RHSA-2026:33462https://access.redhat.com/errata/RHSA-2026:33512https://access.redhat.com/errata/RHSA-2026:33514https://access.redhat.com/errata/RHSA-2026:33515https://access.redhat.com/errata/RHSA-2026:33540https://access.redhat.com/errata/RHSA-2026:33565https://access.redhat.com/errata/RHSA-2026:33576https://access.redhat.com/errata/RHSA-2026:33577https://access.redhat.com/errata/RHSA-2026:33630https://access.redhat.com/errata/RHSA-2026:34076https://access.redhat.com/errata/RHSA-2026:35834https://access.redhat.com/errata/RHSA-2026:35866https://access.redhat.com/errata/RHSA-2026:35867https://access.redhat.com/errata/RHSA-2026:35895https://access.redhat.com/errata/RHSA-2026:36099https://access.redhat.com/errata/RHSA-2026:36978https://access.redhat.com/errata/RHSA-2026:37238https://access.redhat.com/errata/RHSA-2026:37397https://access.redhat.com/errata/RHSA-2026:38694https://access.redhat.com/errata/RHSA-2026:40380https://access.redhat.com/security/cve/CVE-2026-42258https://bugzilla.redhat.com/show_bug.cgi?id=2468498https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42258.json