Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-18252

CVE-2026-18252HIGH

GitLab GitLab — Inclusion of Functionality from Untrusted Control Sphere in GitLab

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  H  N    8.1   .0042   33.9     —

AFFECTED
  Product  Versions  Fixed
  GitLab   18.9 –    —

TIMELINE
  Jul 29  Reserved by GitLab
  Aug 26  Published (CNA: GitLab)
  Aug 27  EXPLOIT PUBLISHED — CVE-2026-18252 (GitLab). Public exploit reference added.
  Aug 31  RESCORED — CVE-2026-18252 (GitLab). CVSS 7.3 → 8.1 (NVD).

CWE-829 · CNA: GitLab · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

GitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role permissions could have executed arbitrary commands in a CI context, due to the Claude agent processing configuration from a user-controlled source.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 29, 2026	Reserved	Reserved by GitLab
August 26, 2026	Published	Published (CNA: GitLab)
August 27, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-18252 (GitLab). Public exploit reference added.
August 31, 2026	RESCORED	RESCORED — CVE-2026-18252 (GitLab). CVSS 7.3 → 8.1 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
GitLab	GitLab	—	18.9	—

Weaknesses

CWE-829

References (3)

https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/ [Release Notes, Vendor Advisory]
https://gitlab.com/gitlab-org/gitlab/-/work_items/607342 [Issue Tracking]
https://hackerone.com/reports/3863650 [Permissions Required, Third Party Advisory]

Authoritative record: CVE-2026-18252 at cve.org

Vendors: gitlab

Weaknesses: CWE-829

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-18252 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.