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CVE-2026-42257VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-42257· Medium 5.8

Not known to be exploited · CVSS 5.8 Medium · fixed in Red Hat package updates : update Red Hat when convenient.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 4.0 base score
5.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 37% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.6.4, 0.5.14, 0.4.24
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade net-imap to 0.6.4, 0.5.14 or 0.4.24.

Affected software

ProductAffectedFixed in
rubynet-imapAffected
  • >=0.6.0 <0.6.4
Fixed in
  • 0.6.4
rubynet-imapAffected
  • >=0.5.0 <0.5.14
Fixed in
  • 0.5.14
rubynet-imapAffected
  • <0.4.24
Fixed in
  • 0.4.24

AI-suggested

Red Hat has released updated ruby4.0 RPM packages (version 4.0.5-35.hum1) that fix this vulnerability. Users of affected Red Hat Hardened Images should apply these updates as soon as possible. The vendor advisory provides detailed instructions for applying the update. No additional mitigations are specified. Patch status is confirmed as fixed in the updated RPMs.

Description

This update includes the following RPMs: ruby4.0: * ruby4.0-4.0.5-35.hum1 (aarch64, x86_64) * ruby4.0-bundled-gems-4.0.5-35.hum1 (aarch64, x86_64) * ruby4.0-default-gems-4.0.5-35.hum1 (noarch) * ruby4.0-devel-4.0.5-35.hum1 (aarch64, x86_64) * ruby4.0-doc-4.0.5-35.hum1 (noarch) * ruby4.0-libs-4.0.5-35.hum1 (aarch64, x86_64) * rubygem4.0-bigdecimal-4.0.1-35.hum1 (aarch64, x86_64) * rubygem4.0-bundler-4.0.10-35.hum1 (noarch) * rubygem4.0-devel-4.0.10-35.hum1 (noarch) * rubygem4.0-io-console-0.8.2-35.hum1 (aarch64, x86_64) * rubygem4.0-irb-1.16.0-35.hum1 (noarch) * rubygem4.0-json-2.18.0-35.hum1 (aarch64, x86_64) * rubygem4.0-minitest-6.0.0-35.hum1 (noarch) * rubygem4.0-power_assert-3.0.1-35.hum1 (noarch) * rubygem4.0-psych-5.3.1-35.hum1 (aarch64, x86_64) * rubygem4.0-racc-1.8.1-35.hum1 (aarch64, x86_64) * rubygem4.0-rake-13.3.1-35.hum1 (noarch) * rubygem4.0-rbs-3.10.0-35.hum1 (aarch64, x86_64) * rubygem4.0-rdoc-7.0.4-35.hum1 (noarch) * rubygem4.0-rexml-3.4.4-35.hum1 (noarch) * rubygem4.0-rss-0.3.2-35.hum1 (noarch) * rubygem4.0-rubygems-4.0.10-35.hum1 (noarch) * rubygem4.0-test-unit-3.7.5-35.hum1 (noarch) * rubygem4.0-typeprof-0.31.1-35.hum1 (noarch) * ruby4.0-4.0.5-35.hum1.src (src)

References

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