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CVE-2026-89078VulnerabilityPublished

Red Hat Security Advisory: ruby:3.3 security, bug fix, and enhancement update

Affects Red Hat ruby:3.3 security,Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-89078· Critical 9.9

Not known to be exploited · CVSS 9.9 Critical · fixed in Red Hat package updates : patch Red Hat gitlab as a priority.

Data as of 9 Nov 2026, 06:52 UTC

CVSS 3.1 base score
9.9Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitLab)CVSS 3.19.9
Patch
Available – fixed in 19.4.1, 19.3.3, 19.2.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Sep 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 8 Nov 2026.

What to do

Upgrade GitLab and gitlab to 19.4.1, 19.3.3 or 19.2.7.

Affected software

ProductAffectedFixed in
GitLabGitLabAffected
  • >=19.4 <19.4.1
Fixed in
  • 19.4.1
GitLabGitLabAffected
  • >=19.3 <19.3.3
Fixed in
  • 19.3.3
GitLabGitLabAffected
  • >=19.2 <19.2.7
Fixed in
  • 19.2.7
RubyGemsgitlabpkg:gem/gitlabOther threatsAffected
  • >=19.2 <19.2.7
  • >=19.3 <19.3.3
  • >=19.4 <19.4.1
Fixed in
  • 19.2.7
  • 19.3.3
  • 19.4.1

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

AI-suggested

A security update for Ruby 3.3 is available from Red Hat for Red Hat Enterprise Linux 9. Users should apply this update to incorporate the fixes for the double free and integer overflow vulnerabilities. Refer to the Red Hat advisory RHSA-2026:96068 and the update instructions at https://access.redhat.com/articles/11258 for guidance on applying the patch. No additional mitigation steps are indicated.

Description

Multiple security vulnerabilities have been identified in Ruby 3.3, including a double free issue in the regular expression parser and several integer overflow issues in the regular expression compiler. These vulnerabilities have been addressed in a security update released by Red Hat for Red Hat Enterprise Linux 9. The update rebases Ruby 3.3 to the latest upstream release, incorporating these security fixes along with bug fixes and enhancements.

References

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