CVEs / CVE-2021-39935
CVE-2021-39935: GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability
- Known exploited in the CISA KEV catalog since 3 Feb 2026
- high 7.5 CVSS 3.1 (NVD)
- EPSS 36.1% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
GitLab Community and Enterprise Editions contain a server-side request forgery vulnerability which could allow unauthorized external users to perform Server Side Requests via the CI Lint API.
Description
An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. Unauthorized external users could perform Server Side Requests via the CI Lint API
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| GitLab GitLab | >=10.5, <14.3.6 | — |
| GitLab GitLab | >=14.4, <14.4.4 | — |
| GitLab GitLab | >=14.5, <14.5.2 | — |
Exploitation
| In CISA KEV since | 3 Feb 2026 |
|---|---|
| Due date for US federal agencies | 24 Feb 2026 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NScored by NVD |
|---|---|
| Weakness | CWE-918 |
References
- CVE-2021-39935 on NVD
- CVE-2021-39935 in the CISA KEV catalog
- https://about.gitlab.com/releases/2021/12/06/security-release-gitlab-14-5-2-released/ (cited by CISA)
- CVE-2021-39935 on OSV
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39935.json Third Party Advisory
- https://gitlab.com/gitlab-org/gitlab/-/issues/346187 Issue Tracking, Vendor Advisory
- https://hackerone.com/reports/1236965 Permissions Required, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39935 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.