CVE & CISA-KEV CatalogNVD
CVE-2026-42258
MEDIUM5.3
CVSS v3
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.
How to fix
Remediation Available
rubyRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
rubyRocky
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-bundled-gemsRocky
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
ruby-bundled-gemsRed Hat / RHEL
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-bundled-gems-debuginfoRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-bundled-gems-debuginfoRocky
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-debuginfoRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-debuginfoRocky
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
ruby-debugsourceRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
ruby-debugsourceRocky
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
ruby-default-gemsRocky
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-7.module+el8.10.0+24407+4a33a056.noarch::ruby:3.3RHSA-2026:33515
Fixed in:0:3.3.10-7.module+el9.8.0+24406+8975e57f.noarch::ruby:3.3RHSA-2026:33576
Fixed in:0:3.3.10-7.module+el9.4.0+24474+8fc4d0bd.noarch::ruby:3.3RHSA-2026:36099
Fixed in:0:3.3.10-6.module+el9.6.0+24475+76cce029.noarch::ruby:3.3RHSA-2026:37238
Fixed in:0:4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch::ruby:4.0RHSA-2026:33577
Fixed in:0:3.0.4-161.el9_2.3RHSA-2026:35834
ruby-default-gemsRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-7.module+el9.8.0+24406+8975e57f.noarch::ruby:3.3RHSA-2026:33576
Fixed in:0:4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch::ruby:4.0RHSA-2026:33577
Fixed in:0:3.3.10-6.module+el9.6.0+24475+76cce029.noarch::ruby:3.3RHSA-2026:37238
Fixed in:0:3.3.10-7.module+el9.4.0+24474+8fc4d0bd.noarch::ruby:3.3RHSA-2026:36099
Fixed in:0:3.3.10-7.module+el8.10.0+24407+4a33a056.noarch::ruby:3.3RHSA-2026:33515
Fixed in:0:3.0.7-167.el9_8RHSA-2026:33512
ruby-develRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
ruby-develRocky
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
ruby-docRocky
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:3.3.10-6.module+el9.6.0+24475+76cce029.noarch::ruby:3.3RHSA-2026:37238
Fixed in:0:3.3.10-7.module+el8.10.0+24407+4a33a056.noarch::ruby:3.3RHSA-2026:33515
Fixed in:0:4.0.3-33.module+el9.8.0+24428+77f1d00a.noarch::ruby:4.0RHSA-2026:33577
Fixed in:0:2.5.9-112.module+el8.6.0+24478+6e23d6ba.noarch::ruby:2.5RHSA-2026:35867
Fixed in:0:2.5.9-115.module+el8.10.0+24408+7ffaaa88.noarch::ruby:2.5RHSA-2026:33514
ruby-docRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:2.5.9-112.module+el8.6.0+24478+6e23d6ba.noarch::ruby:2.5RHSA-2026:35867
Fixed in:0:3.3.10-7.module+el9.8.0+24406+8975e57f.noarch::ruby:3.3RHSA-2026:33576
Fixed in:0:3.3.10-7.module+el8.10.0+24407+4a33a056.noarch::ruby:3.3RHSA-2026:33515
Fixed in:0:2.5.9-115.module+el8.10.0+24408+7ffaaa88.noarch::ruby:2.5RHSA-2026:33514
Fixed in:0:3.3.10-6.module+el9.6.0+24475+76cce029.noarch::ruby:3.3RHSA-2026:37238
ruby-irbRed Hat / RHEL
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:2.5.9-109.module+el8.4.0+24479+aaeed2c5.noarch::ruby:2.5RHSA-2026:35866
Fixed in:0:2.5.9-115.module+el8.10.0+24408+7ffaaa88.noarch::ruby:2.5RHSA-2026:33514
Fixed in:0:2.5.9-112.module+el8.8.0+24452+e70e99ef.noarch::ruby:2.5RHSA-2026:34076
Fixed in:0:2.5.9-112.module+el8.6.0+24478+6e23d6ba.noarch::ruby:2.5RHSA-2026:35867
ruby-irbRocky
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:2.5.9-109.module+el8.4.0+24479+aaeed2c5.noarch::ruby:2.5RHSA-2026:35866
Fixed in:0:2.5.9-115.module+el8.10.0+24408+7ffaaa88.noarch::ruby:2.5RHSA-2026:33514
Fixed in:0:2.5.9-112.module+el8.6.0+24478+6e23d6ba.noarch::ruby:2.5RHSA-2026:35867
Fixed in:0:2.5.9-112.module+el8.8.0+24452+e70e99ef.noarch::ruby:2.5RHSA-2026:34076
ruby-libsRocky
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-libsRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-libs-debuginfoRed Hat / RHEL
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-libs-debuginfoRocky
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
Fixed in:0:3.3.10-11.el10_0.2RHSA-2026:35895
Fixed in:0:3.3.10-13.el10_2RHSA-2026:33565
ruby-tcltkRed Hat / RHEL
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:2.0.0.648-39.el7_9.1.ppc64RHSA-2026:37397
ruby-tcltkRocky
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:2.0.0.648-39.el7_9.1.ppc64RHSA-2026:37397
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
Fixed in:0:2.0.0.648-39.el7_9.1RHSA-2026:37397
ruby3Rocky
Fixed in:3-main@aarch64RHSA-2026:40380
Fixed in:3-main@x86_64RHSA-2026:40380
Fixed in:3-main@srcRHSA-2026:40380
Fixed in:3-main@noarchRHSA-2026:40380
ruby3Red Hat / RHEL
Fixed in:3-main@aarch64RHSA-2026:40380
Fixed in:3-main@noarchRHSA-2026:40380
Fixed in:3-main@x86_64RHSA-2026:40380
Fixed in:3-main@srcRHSA-2026:40380
ruby4.0Red Hat / RHEL
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
ruby4.0Rocky
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
ruby4.0-debuginfoRed Hat / RHEL
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
ruby4.0-debuginfoRocky
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
Fixed in:0:4.0.3-35.el10_2RHSA-2026:33540
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
Exploit Intelligence
0.78%probability of exploitation in 30 days
53rdpercentile
Moderate risk: more likely to be exploited than 53% of all known CVEs.
References
Vendor Advisory1
Release Notes3
Other references23
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- bugzilla.redhat.com
- security.access.redhat.com
Related Vulnerabilities
Other CWE-77 (Command Injection) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-3400 | Critical | 10.0 | 100% | KEV + Ransom | - |
| CVE-2024-21887 | Critical | 9.1 | 100% | KEV + Ransom | - |
| CVE-2023-1671 | Critical | 9.8 | 100% | KEV | Fix |
| CVE-2023-1389 | High | 8.8 | 100% | KEV | Fix |
| CVE-2021-1498 | Critical | 9.8 | 100% | KEV | Fix |
| CVE-2012-1823 | Critical | 9.8 | 100% | KEV | Fix |
Common questions
How do I fix CVE-2026-42258?
Published advisories record a fix for 114 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-42258 being actively exploited?
Not that we know of. CVE-2026-42258 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.78% is the estimated probability that it will be exploited in the next 30 days. That is higher than 53% of all scored CVEs.
How severe is CVE-2026-42258?
CVE-2026-42258 has a CVSS v3 base score of 5.3, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-42258 affect?
Published advisories record a fix for ruby (Red Hat / RHEL), ruby (Rocky), ruby-bundled-gems (Rocky), ruby-bundled-gems (Red Hat / RHEL), and 110 more. The list on this page is capped, so there may be more.
Embed a live status badge for CVE-2026-42258
Markdown
[](https://tridentstack.com/cve/CVE-2026-42258)HTML
<a href="https://tridentstack.com/cve/CVE-2026-42258"><img src="https://tridentstack.com/cve/badge/CVE-2026-42258.svg" alt="CVE-2026-42258"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-24.