Advisoriesby IbisGitLabCVE-2026-87719
GitLab: unsafe deserialization
Fix: upgrade to 18.11.12 or later (4 fixed versions below)
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| GitLab Product | >= 18.3, < 18.11.12 | 18.11.12 |
| >= 19.0, < 19.0.9 | 19.0.9 | |
| >= 19.1, < 19.1.8 | 19.1.8 | |
| >= 19.2, < 19.2.6 | 19.2.6 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-502