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CVE-2026-42245VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-42245· Low 2.3

Not known to be exploited · CVSS 2.3 Low · fixed in Red Hat package updates : update Red Hat net-imap when convenient.

Data as of 12 Nov 2026, 23:24 UTC

CVSS 4.0 base score
2.3Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 35% 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:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/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 13 Nov 2026.

What to do

Upgrade net-imap to 0.6.4, 0.5.14 or 0.4.24; net-imap to 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
RubyGemsnet-imappkg:gem/net-imapOther threatsAffected
  • <0.4.24
Fixed in
  • 0.4.24

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated RPM packages that fix this vulnerability. Users should apply the security update to ruby3.3 and related packages as provided by Red Hat Hardened Images RPMs. Additionally, to reduce risk, applications using the Net::IMAP library should be configured to connect only to trusted IMAP servers and avoid untrusted or unverified IMAP services. This operational control helps prevent exposure to malicious IMAP responses. Patch status is confirmed fixed in ruby3.3 version 3.3.10-23.2.hum1 and associated packages.

Description

This security update provides a functional equivalent of RHSA-2026:33577. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2026:33577.

References

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