CVE-2026-42258
CVE-2026-42258 · net-imap: Command Injection via unvalidated Symbol inputs
This page contains facts from public vulnerability sources. Check the original advisory before updating.
This page shows selected source facts. See the linked advisories for the complete description and affected versions.
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 5.8 · Medium · EPSS 0.8% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
net-imap
- Versions
- < 0.4.24: Affected
- >= 0.5.0, < 0.5.14: Affected
- >= 0.6.0, < 0.6.4: Affected
No fix published
ruby3.1 Debian:12
- Versions
- 3.1.2-7
- 3.1.2-7+deb12u1
- 3.1.2-7+hurd.1
- 3.1.2-8
- 3.1.2-8.1~exp1
- 3.1.2-8.3
- 3.1.2-8.4
- 3.1.2-8.5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby3.3 Debian:13
- Versions
- 3.3.8-2
- 3.3.8-2.1
- 3.3.8-2.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby3.3 Debian:14
- Versions
- 3.3.8-2
- 3.3.8-2.1
- 3.3.8-2.2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jruby Ubuntu:Pro:14.04:LTS
- Versions
- 1.5.6-5ubuntu1
- 1.5.6-6
- 1.5.6-7
- 1.5.6-9+deb8u2build0.14.04.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby2.3 Ubuntu:Pro:16.04:LTS
- Versions
- 2.3.0-1
- 2.3.0-2
- 2.3.0-4ubuntu2
- 2.3.0-4ubuntu3
- 2.3.0-5ubuntu1
- 2.3.1-2~16.04
- 2.3.1-2~16.04.2
- 2.3.1-2~16.04.4
- 2.3.1-2~16.04.5
- 2.3.1-2~16.04.6
- 2.3.1-2~16.04.7
- 2.3.1-2~16.04.9
- 2.3.1-2~16.04.10
- 2.3.1-2~16.04.11
- 2.3.1-2~16.04.12
- 2.3.1-2~ubuntu16.04.13
- 2.3.1-2~ubuntu16.04.14
- 2.3.1-2~ubuntu16.04.15
- 2.3.1-2~ubuntu16.04.16
- 2.3.1-2~ubuntu16.04.16+esm1
- 2.3.1-2~ubuntu16.04.16+esm2
- 2.3.1-2~ubuntu16.04.16+esm3
- 2.3.1-2~ubuntu16.04.16+esm4
- 2.3.1-2~ubuntu16.04.16+esm5
- 2.3.1-2~ubuntu16.04.16+esm6
- 2.3.1-2~ubuntu16.04.16+esm7
- 2.3.1-2~ubuntu16.04.16+esm8
- 2.3.1-2~ubuntu16.04.16+esm9
- 2.3.1-2~ubuntu16.04.16+esm10
- 2.3.1-2~ubuntu16.04.16+esm11
- 2.3.1-2~ubuntu16.04.16+esm12
- 2.3.1-2~ubuntu16.04.16+esm14
- Affected ranges
- ECOSYSTEM: < 2.3.1-2~ubuntu16.04.16+esm15
Update to 2.3.1-2~ubuntu16.04.16+esm15
jruby Ubuntu:16.04:LTS
- Versions
- 1.7.21-2ubuntu4
- 1.7.22-1ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby2.5 Ubuntu:Pro:18.04:LTS
- Versions
- 2.5.0~preview1-1ubuntu2
- 2.5.0-4ubuntu1
- 2.5.0-4ubuntu4
- 2.5.0-5ubuntu1
- 2.5.0-6ubuntu1
- 2.5.1-1ubuntu1
- 2.5.1-1ubuntu1.1
- 2.5.1-1ubuntu1.2
- 2.5.1-1ubuntu1.4
- 2.5.1-1ubuntu1.5
- 2.5.1-1ubuntu1.6
- 2.5.1-1ubuntu1.7
- 2.5.1-1ubuntu1.8
- 2.5.1-1ubuntu1.9
- 2.5.1-1ubuntu1.10
- 2.5.1-1ubuntu1.11
- 2.5.1-1ubuntu1.12
- 2.5.1-1ubuntu1.13
- 2.5.1-1ubuntu1.14
- 2.5.1-1ubuntu1.15
- 2.5.1-1ubuntu1.16
- 2.5.1-1ubuntu1.16+esm1
- 2.5.1-1ubuntu1.16+esm3
- 2.5.1-1ubuntu1.16+esm4
- 2.5.1-1ubuntu1.16+esm5
- 2.5.1-1ubuntu1.16+esm6
- 2.5.1-1ubuntu1.16+esm7
- 2.5.1-1ubuntu1.16+esm8
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jruby Ubuntu:18.04:LTS
- Versions
- 9.1.13.0-1
- 9.1.17.0-1~18.04
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby2.7 Ubuntu:Pro:20.04:LTS
- Versions
- 2.7.0-1
- 2.7.0-2
- 2.7.0-3
- 2.7.0-4
- 2.7.0-4ubuntu1
- 2.7.0-5ubuntu1
- 2.7.0-5ubuntu1.1
- 2.7.0-5ubuntu1.2
- 2.7.0-5ubuntu1.3
- 2.7.0-5ubuntu1.4
- 2.7.0-5ubuntu1.5
- 2.7.0-5ubuntu1.6
- 2.7.0-5ubuntu1.7
- 2.7.0-5ubuntu1.8
- 2.7.0-5ubuntu1.9
- 2.7.0-5ubuntu1.10
- 2.7.0-5ubuntu1.11
- 2.7.0-5ubuntu1.12
- 2.7.0-5ubuntu1.13
- 2.7.0-5ubuntu1.14
- 2.7.0-5ubuntu1.15
- 2.7.0-5ubuntu1.16
- 2.7.0-5ubuntu1.17
- 2.7.0-5ubuntu1.18
- 2.7.0-5ubuntu1.18+esm1
- 2.7.0-5ubuntu1.18+esm3
- 2.7.0-5ubuntu1.18+esm4
- 2.7.0-5ubuntu1.18+esm5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jruby Ubuntu:20.04:LTS
- Versions
- 9.1.17.0-3
- 9.1.17.0-3build5
- 9.1.17.0-3build6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby3.0 Ubuntu:22.04:LTS
- Versions
- 3.0.2-5ubuntu1
- 3.0.2-7
- 3.0.2-7ubuntu2
- 3.0.2-7ubuntu2.1
- 3.0.2-7ubuntu2.2
- 3.0.2-7ubuntu2.3
- 3.0.2-7ubuntu2.4
- 3.0.2-7ubuntu2.5
- 3.0.2-7ubuntu2.6
- 3.0.2-7ubuntu2.7
- 3.0.2-7ubuntu2.8
- 3.0.2-7ubuntu2.10
- 3.0.2-7ubuntu2.11
- 3.0.2-7ubuntu2.12
- 3.0.2-7ubuntu2.13
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jruby Ubuntu:24.04:LTS
- Versions
- 9.3.9.0+ds-1
- 9.4.5.0+ds-1
- 9.4.5.0+ds-1ubuntu1
- 9.4.6.0+ds-1ubuntu3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby3.2 Ubuntu:24.04:LTS
- Versions
- 3.2.3-1
- 3.2.3-1build2
- 3.2.3-1build3
- 3.2.3-1ubuntu0.24.04.1
- 3.2.3-1ubuntu0.24.04.3
- 3.2.3-1ubuntu0.24.04.5
- 3.2.3-1ubuntu0.24.04.6
- 3.2.3-1ubuntu0.24.04.7
- 3.2.3-1ubuntu0.24.04.8
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jruby Ubuntu:25.10
- Versions
- 9.4.8.0+ds-2ubuntu1
- 9.4.8.0+ds-3ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby3.3 Ubuntu:25.10
- Versions
- 3.3.7-1ubuntu2
- 3.3.8-2ubuntu1
- 3.3.8-2ubuntu2
- 3.3.8-2ubuntu2.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jruby Ubuntu:26.10
- Versions
- 9.4.8.0+ds-3ubuntu1
- 9.4.14.0+ds-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby3.3 Ubuntu:26.10
- Versions
- 3.3.8-2ubuntu3
- 3.3.8-2.2ubuntu4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
jruby Ubuntu:26.04:LTS
- Versions
- 9.4.8.0+ds-3ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
ruby3.3 Ubuntu:26.04:LTS
- Versions
- 3.3.8-2ubuntu2
- 3.3.8-2ubuntu3
- 3.3.8-2ubuntu3.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://github.com/ruby/net-imap/security/advisories/GHSA-75xq-5h9v-w6px
- 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://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
- https://access.redhat.com/errata/RHSA-2026:37397
- https://access.redhat.com/errata/RHSA-2026:35895
- https://access.redhat.com/errata/RHSA-2026:33565
- https://access.redhat.com/errata/RHSA-2026:33540
- https://access.redhat.com/errata/RHSA-2026:33514
- https://access.redhat.com/errata/RHSA-2026:33515
- https://access.redhat.com/errata/RHSA-2026:35866
- https://access.redhat.com/errata/RHSA-2026:35867
- https://access.redhat.com/errata/RHSA-2026:34076
- https://access.redhat.com/errata/RHSA-2026:35834
- https://access.redhat.com/errata/RHSA-2026:33630
- https://access.redhat.com/errata/RHSA-2026:36099
- https://access.redhat.com/errata/RHSA-2026:33462
- https://access.redhat.com/errata/RHSA-2026:37238
- https://access.redhat.com/errata/RHSA-2026:33512
- https://access.redhat.com/errata/RHSA-2026:33576
- https://nvd.nist.gov/vuln/detail/CVE-2026-42258