CVE-2023-2199

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-06-07 · updated 2026-06-17
Weakness: CWE-1333

Description

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.

Affected products

GitLab: from 12.0.0 before 15.10.8; from 15.11.0 before 15.11.7; from 16.0.0 before 16.0.2 — fixed in 15.10.8, 15.11.7, 16.0.2

How to fix

Upgrade to a fixed version: GitLab 15.10.8, 15.11.7, 16.0.2. Check the vendor advisory for mitigations.

References

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

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