CVE-2023-2199 — An issue has been discovered in GitLab CE/EE affecting all versions starting fro

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.0 before 15.10.8, all versions starting from 15.11 before 15.11.7, all versions starting from 16.0 before 16.0.2. A Regular Expression Denial of Service was possible via sending crafted payloads

01What is this vulnerability?

An issue has been discovered in GitLab CE/EE affecting all versions starting from 12.0 before 15.10.8, all versions starting from 15.11 before 15.11.7, all versions starting from 16.0 before 16.0.2. A Regular Expression Denial of Service was possible via sending crafted payloads to the preview_markdown endpoint.

02Affected products

Vendor	Product	Versions
GitLab	GitLab	>=12.0, <15.10.8, >=15.11, <15.11.7, >=16.0, <16.0.2

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-06-07T00:00:00.000Z
• Last modified: 2025-01-07T16:45:38.544Z

09References

• gitlab.com — https://gitlab.com/gitlab-org/gitlab/-/issues/408272
• hackerone.com — https://hackerone.com/reports/1943819
• gitlab.com — https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-2199.json