UpHeron
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Servers and applications

CVE-2026-1388

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions.

Severity
High 7.5
Published
25 Feb 2026
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
18.7.5, 18.8.5
Sources
NVD

Affected software

SoftwareAffected versions
GitLabServers and applications · cpe:a:gitlab:gitlab
  • From 9.2.0 before 18.7.5
  • From 18.8.0 before 18.8.5
  • Version 18.9.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-1388
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-1388