CVE-2023-6688 Inefficient Regular Expression Complexity in GitLab
An attacker can cause a denial of service on GitLab servers via inefficient regular expressions in the Google Chat integration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-6688?
CVE-2023-6688 is a medium-severity denial of service vulnerability in Gitlab Gitlab, published on 9 May 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue has been discovered in GitLab CE/EE affecting all versions starting from 16.11 prior to 16.11.2. A problem with the processing logic for Google Chat Messages integration may lead to a regular expression DoS attack on the server.
Weakness: CWE-1333
Which versions are affected by CVE-2023-6688?
1 open source package ship an affected version, including gitlab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | From 16.11.0 | 16.11.2 |
Products include Gitlab Gitlab.
How do I fix CVE-2023-6688?
Upgrade gitlab to 16.11.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-6688 being exploited?
There is no known exploitation of CVE-2023-6688 in the wild and no public exploit code.
Other vulnerabilities in Gitlab Gitlab
- CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound
- CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal
- CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control
- CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution
- CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF)
Sources
Also known as BIT-gitlab-2023-6688, GHSA-h453-7rrx-q6j5, UBUNTU-CVE-2023-6688.