Check the exact GitLab version, edition, installation method, and topology against the current security advisory, then follow GitLab’s supported upgrade path to a fixed release. For the September 23, 2026 critical patch announcement, GitLab recommended specific targets for affected installations on branches 18.11 through 19.3; those version numbers are a dated snapshot, not evergreen guidance.
First, determine whether your installation is affected
Do not decide from a major version number alone. Record the installation’s exact version, Community Edition (CE) or Enterprise Edition (EE), installation method, topology, and enabled services. Compare those details with the affected ranges and fixed versions in the live GitLab security advisory. An advisory can cover only particular editions or version ranges, and vulnerabilities in the same release notice may have different scopes.
GitLab’s September 23, 2026 critical patch release covered CE and EE and named two critical issues: CVE-2026-85706, a path-traversal issue in the repository commits API, and CVE-2026-87719, an insecure-deserialization issue in the GraphQL subscription serializer. The notice says CVE-2026-87719 affects EE in specified ranges beginning at 18.3 and below the listed fixed versions; consult the advisory for the precise affected ranges rather than assuming the issue applies to every edition or deployment.
Which fixed GitLab version should you install?
The following targets come from GitLab’s September 23, 2026 announcement. Confirm the live advisory before acting, because security releases and supported branches can change.
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| Installed branch | Target stated in the September 23, 2026 notice | Important qualification |
|---|---|---|
| 18.11 | 18.11.12 | Recommendation for affected installations still on this branch |
| 19.0 | 19.0.9 | Recommendation for affected installations still on this branch |
| 19.1 | 19.1.8 or later | Target stated for this branch |
| 19.2 | 19.2.6 or later | Target stated for this branch |
| 19.3 | 19.3.2 or later | Target stated for this branch |
GitLab said the named security fixes were included in these releases. The 18.11 and 19.0 releases are backports; they do not include other fixes available in newer supported release lines. GitLab said the newer-branch fixes were first patched in 19.1.8, 19.2.6, and 19.3.2 on September 10, 2026, before backporting to 18.11 and 19.0.
How to plan the upgrade without skipping required steps
Choose the supported upgrade path
Use GitLab’s upgrade-path documentation for the exact starting version and target. Some installations require intermediate stops; select the latest available patch for each required major.minor stop, and let background migrations finish before proceeding. Do not bypass required stops because the security fix is urgent. If operational constraints prevent the documented route, seek appropriate GitLab support rather than improvising a sequence.
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The procedure depends on whether the installation uses Linux packages, source, Helm, an Operator, or Docker, and whether it is single-node, multi-node, or Geo. GitLab’s general upgrade guidance separates these deployment and topology cases, including multi-node approaches with and without downtime. Follow the instructions for the actual setup; there is no universal command sequence or guaranteed zero-downtime method.
Check compatibility and recovery before maintenance
- Review OS and version compatibility, the relevant release and upgrade notes, pre-upgrade health checks, and the maintenance plan.
- Document the recovery procedure and take a backup or appropriate complete snapshots. Include configuration and secrets as well as application data.
- Where feasible, rehearse the upgrade and restoration on a production-like clone. A backup is not a recovery plan until the relevant restore prerequisites have been checked.
- For Geo deployments, follow the applicable Geo upgrade instructions.
GitLab’s restoration instructions can require the restored system to match the backup’s version and edition. Apply the specific prerequisites for the backup and deployment type you have; do not assume a backup can be restored across arbitrary versions or editions.
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What should you back up before patching?
Back up according to the deployment’s official procedure. For Linux package installations, keep /etc/gitlab, including configuration and certificates, securely and separately from application backups. Preserve gitlab-secrets.json: its encryption keys protect data that includes two-factor authentication secrets and secure CI variables. Losing configuration or secrets can prevent access to encrypted data or accounts even if application data is available. Other deployment types have their own backup procedures, so do not apply Linux-package instructions to them by default.
How to apply the patch and verify the result
- Confirm the target and sequence. Match the installed version and edition to the live advisory, then determine required stops from the supported upgrade path.
- Perform the deployment-specific upgrade. Use the current GitLab procedure for the installation method and topology, following its maintenance and downtime guidance.
- Wait for required migrations. Check that background migrations have completed before moving to the next required stop.
- Run post-upgrade checks. Use GitLab’s documented health checks, verify the UI and core services, and review logs and monitoring for errors.
- Check the recovered version and protected data. Record the resulting version and, where GitLab documents an applicable check, verify that secrets can be decrypted.
What to harden after the upgrade
Review accounts and sign-in protections
Review administrator accounts and sign-in controls. Enforce two-factor authentication in a way that is compatible with any upstream single sign-on policy, and retain recovery codes securely. GitLab documents WebAuthn; whether a FIDO2 security key is suitable depends on the organization’s GitLab and identity-provider setup.
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Review visibility, integrations, and network access
Check project and instance visibility defaults, enabled Git access protocols, integrations, and network exposure. GitLab’s operating-system guidance says ports 80 and 443 are sufficient for basic use, with HTTP redirected to HTTPS. Other enabled services may need additional access; restrict those services to the hosts or networks that need them rather than opening ports broadly.
How to track later disclosures and fixes
Monitor GitLab security release posts for descriptions, affected versions, and CVE identifiers, and use the live advisory to check whether later fixes alter the recommended target. GitLab’s security FAQ recommends the latest security release for the supported version. GitLab’s coordinated disclosure policy says public disclosure generally follows 90 days after a fix is released; it directs vulnerability reports to HackerOne or, in the circumstances it describes, a confidential issue.
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