CVE-2021-39935

An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14...

6.8 MediumIn KEVFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

36.1%Up 35.3 points since Dec 13, 2021

What each source reports

CVE List Score used 6.8

Record: CVE-2021-39935
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness: CWE-918
Updated: 2026-11-02

EUVDEUVD-2021-26291 6.8

Record: EUVD-2021-26291
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-22hj-9cx7-p2hw 7.5

An issue has been discovered in GitLab CE/EE affecting all versions starting from 10.5 before 14...

Record: GHSA-22hj-9cx7-p2hw
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-918
Updated: 2026-11-02

CISA KEV No score

GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Vulnerability

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.

Record: CVE-2021-39935
Weakness: CWE-918
Updated: 2026-11-02

NVD 6.8

Record: CVE-2021-39935
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness: CWE-918
Updated: 2026-11-02

OSV 7.5

Record: CVE-2021-39935
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-39935 7.5

Record: UBUNTU-CVE-2021-39935
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Updated: 2026-11-02

OSVBIT-gitlab-2021-39935 No score

Record: BIT-gitlab-2021-39935
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`gitlab` Bitnami	10.5.0 up to 14.3.6, 14.4.0 up to 14.4.4, 14.5.0 up to 14.5.2	14.3.614.4.414.5.2
`gitlab` Ubuntu:16.04:LTS	All versions, plus listed versions 8.4.3+dfsg-98.4.3+dfsg-128.5.8+dfsg-5	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	exploitation
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, CISA KEV, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-39935 is a medium vulnerability (CVSS 6.8) in Gitlab, published December 13, 2021. CISA lists it as known to be exploited, since February 3, 2026. EUVD reports exploitation since February 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 36.1%, the 98th percentile. Fixed in gitlab 14.3.6.