CVE-2026-1659
HIGH 7.5 ALL-YEARSGitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.0 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to cause denial of service by sending specially crafted requests due to insufficient input validation.
Severe if exploited (CVSS 7.5), but no confirmed exploitation. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 29th 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-770: : Allocation of Resources Without Limits or Throttling
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 | ≥ 9.0.0 and < 18.9.7 |
| Gitlab | Gitlab | ≥ 9.0.0 and < 18.9.7 |
| Gitlab | Gitlab | ≥ 18.10.0 and < 18.10.6 |
| Gitlab | Gitlab | ≥ 18.10.0 and < 18.10.6 |
| Gitlab | Gitlab | ≥ 18.11.0 and < 18.11.3 |
| Gitlab | Gitlab | ≥ 18.11.0 and < 18.11.3 |
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/3519824 CVE record · GitLab · Updated 2026-05-14T05:36:32.362Z
NVD · CVE-2026-1659 · Updated 2026-06-17T10:16:16.130
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30222 EUVD · EUVD-2026-30222
Technical & other
- https://gitlab.com/gitlab-org/gitlab/-/work_items/588201 CVE record · GitLab · Updated 2026-05-14T05:36:32.362Z
NVD · CVE-2026-1659 · Updated 2026-06-17T10:16:16.130 - https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/ CVE record · GitLab · Updated 2026-05-14T05:36:32.362Z
NVD · CVE-2026-1659 · Updated 2026-06-17T10:16:16.130
Sources: NVD · CVE.org · All sources and attribution · EPSS