CVE-2021-39939

MEDIUM

6.5

CVSS Score

Published: December 13, 2021 at 03:48 PM UTC

Updated: June 17, 2026 at 04:04 AM UTC

2 products affected across 1 vendorGitLabGitLab Runner

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.9%

Description

An uncontrolled resource consumption vulnerability in GitLab Runner affecting all versions starting from 13.7 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2, allows an attacker triggering a job with a specially crafted docker image to exhaust resources on runner manager

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitLab · GitLabmaven

95%

13.7.0 ≤ v < 14.3.614.4.0 ≤ v < 14.4.414.5.0 ≤ v < 14.5.2

Affected range stops below 14.3.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.4.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.5.2, so it looks safe — our inference, not a vendor statement

GitLab Runner · GitLabgitlab

60%

v < 14.3.6v < 14.4.4v < 14.5.2

Affected range stops below 14.3.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.4.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 14.5.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_CONFIRMThird Party Advisory

Source: [email protected]

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39939.json

x_refsource_MISCBroken Link

Source: [email protected]

https://gitlab.com/gitlab-org/gitlab-runner/-/issues/28630

CVSS

6.5MEDIUMGitLab

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-400

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