CVE-2026-3988
HIGH 7.5 ALL-YEARSGitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.5 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an unauthenticated user to cause a denial of service by making the GitLab instance unresponsive due to improper input validation in GraphQL request processing.
Severe if exploited (CVSS 7.5), but no confirmed exploitation. Patch on a normal cadence.
Exploitation likelihood
0.5%chance of exploitation in 30 days · 42nd percentile
Impact if exploited
7.5CVSS 3.1 · HIGH · CNA
- ConfidentialityNone
- IntegrityNone
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
Search GitHub now — results may be empty or unverified.
Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Weakness (CWE)
- CWE-407: : Inefficient Algorithmic Complexity
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References and research data (JSON)
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Gitlab | Gitlab | ≥ 18.5.0 and < 18.8.7 |
| Gitlab | Gitlab | ≥ 18.5.0 and < 18.8.7 |
| Gitlab | Gitlab | ≥ 18.9.0 and < 18.9.3 |
| Gitlab | Gitlab | ≥ 18.9.0 and < 18.9.3 |
| Gitlab | Gitlab | 18.10.0 |
| Gitlab | Gitlab | 18.10.0 |
All CVSS metrics
- HIGH 7.5 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - HIGH 7.5 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
Exploit-tagged references (not proof of a PoC)
- https://hackerone.com/reports/3597342 CVE record · GitLab · Updated 2026-03-25T16:33:43.952Z
NVD · CVE-2026-3988 · Updated 2026-06-17T10:44:34.603
Advisories
- https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/ CVE record · GitLab · Updated 2026-03-25T16:33:43.952Z
NVD · CVE-2026-3988 · Updated 2026-06-17T10:44:34.603 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-15937 EUVD · EUVD-2026-15937
Technical & other
- https://gitlab.com/gitlab-org/gitlab/-/work_items/593140 CVE record · GitLab · Updated 2026-03-25T16:33:43.952Z
NVD · CVE-2026-3988 · Updated 2026-06-17T10:44:34.603
Sources: NVD · CVE.org · All sources and attribution · EPSS