CVE-2026-3988 json
Inefficient Algorithmic Complexity in GitLab
published 7mo ago modified 2mo ago also BIT-gitlab-2026-3988 , EUVD-2026-15937
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 42%
- public exploits
- 0
- none known
Summary
GitLab 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.
Patch / fix
- bitnami gitlab 18.8.7, 18.9.3, 18.10.1
- GitLab GitLab 18.8.7, 18.9.3, 18.10.1
Is CVE-2026-3988 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- hackerone.com https://hackerone.com/reports/3597342 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | gitlab | >=18.5.0, <18.8.7 >=18.9.0, <18.9.3 >=18.10.0, <18.10.1 |
18.8.7 18.9.3 18.10.1 |
Affected products
- GitLab GitLab
Classification
- Weakness
-
- CWE-407 Inefficient Algorithmic Complexity
- Technology feeds
References
-
hackerone.com
/reports/3597342
technical-description, exploit, permissions-required, web
-
about.gitlab.com
/releases/2026/03/25/patch-release-gitlab-18-10-1-released/
release-notes, vendor-advisory, advisory
-
gitlab.com
/gitlab-org/gitlab/-/work_items/593140
broken-link, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-3988
web
Sources
- CVE List CVE-2026-3988
- NVD CVE-2026-3988
- OSV BIT-gitlab-2026-3988
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.