Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-87719

CVE-2026-87719CRITICAL

GitLab GitLab — Deserialization of Untrusted Data in GitLab

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  C  H  H  H    9.9   .0057   45.2     —

AFFECTED
  Product  Versions  Fixed
  GitLab   18.3 –    —

TIMELINE
  Sep 9   Reserved by GitLab
  Sep 12  Published (CNA: GitLab)
  Sep 14  EXPLOIT PUBLISHED — CVE-2026-87719 (GitLab). Public exploit reference added.
  Sep 23  EXPLOIT PUBLISHED — CVE-2026-87719 (GitLab). Public exploit reference added.

CWE-502 · CNA: GitLab · CVSS v3.1 · 2 references · NVD status: Analyzed

Description

GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
September 9, 2026	Reserved	Reserved by GitLab
September 12, 2026	Published	Published (CNA: GitLab)
September 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-87719 (GitLab). Public exploit reference added.
September 23, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-87719 (GitLab). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
GitLab	GitLab	—	18.3	—

Weaknesses

CWE-502

References (2)

https://gitlab.com/gitlab-org/gitlab/-/work_items/628160 [Broken Link]
https://hackerone.com/reports/4012289 [Permissions Required]

Authoritative record: CVE-2026-87719 at cve.org

Vendors: gitlab

Weaknesses: CWE-502

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-87719 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 Saturday, October 3, 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.