Inefficient Regular Expression Complexity in GitLab
Priority HIGH 72CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-1333.
Summary
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00409 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed GitLab (GitLab): 18.7.5, 18.8.5, 18.9.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| GitLab | GitLab | 9.2 to before 18.7.5; 18.8 to before 18.8.5; 18.9 to before 18.9.1 | 18.7.5, 18.8.5, 18.9.1 | Patch available | CNA |
- GitLab VendorGitLab Affected 9.2 to before 18.7.5; 18.8 to before 18.8.5; 18.9 to before 18.9.1 Fixed in 18.7.5, 18.8.5, 18.9.1 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* | 9.2.0 to before 18.7.5 | Vulnerable | GitLab |
| cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* | 9.2.0 to before 18.7.5 | Vulnerable | GitLab |
| cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* | 18.8.0 to before 18.8.5 | Vulnerable | GitLab |
| cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* | 18.8.0 to before 18.8.5 | Vulnerable | GitLab |
| cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:community:*:*:* | 18.9.0 | Vulnerable | GitLab |
| cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:enterprise:*:*:* | 18.9.0 | Vulnerable | GitLab |
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* Versions 9.2.0 to before 18.7.5 Vulnerable ·GitLab
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* Versions 9.2.0 to before 18.7.5 Vulnerable ·GitLab
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* Versions 18.8.0 to before 18.8.5 Vulnerable ·GitLab
- cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* Versions 18.8.0 to before 18.8.5 Vulnerable ·GitLab
- cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:community:*:*:* Versions 18.9.0 Vulnerable ·GitLab
- cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:enterprise:*:*:* Versions 18.9.0 Vulnerable ·GitLab
Remediation
- Fix · CNA GitLab (GitLab) Fixed in 18.7.5, 18.8.5, 18.9.1
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
GitLab 18.7.5, 18.8.5, 18.9.1
8 records Highest priority Priority HIGH 2 HIGH, 1 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2026-01346 Allocation of Resources Without Limits or Throttling in GitLabPriority HIGH 72
- TI-2026-01430 Authentication Bypass Using an Alternate Path or Channel in GitLabPriority MEDIUM 53
- TI-2025-13254 Improper Validation of Specified Quantity in Input in GitLabPriority LOW 39
Timeline
- 2026-10-02 Threatist record created from CVE-2026-1388
- 2026-10-03 Alias added: GHSA-35pf-5r93-c5jc
References
More Gitlab vulnerabilities
- TI-2026-71508 Integer overflow in GitLab allows code execution on the server KEVCVSS 3.1CRITICAL 10.0
- TI-2026-58817 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in GitLab KEVCVSS 3.1CRITICAL 10.0
- TI-2023-06425 Weak Password Recovery Mechanism for Forgotten Password in GitLab KEVCVSS 3.1CRITICAL 10.0
- TI-2021-05191 Code injection in GitLab KEVCVSS 3.1CRITICAL 10.0
- TI-2021-05161 Server-side request forgery in GitLab KEVCVSS 3.1CRITICAL 9.8
- TI-2022-02763 Injection in GitLab CVSS 3.1CRITICAL 9.9
Sources
- CVE-2026-1388 · CVE Program
- CVE-2026-1388 · NVD
- FIRST EPSS
- GHSA-35pf-5r93-c5jc · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences