CVE-2026-1403 Allocation of Resources Without Limits or Throttling in GitLab
An authenticated user can cause denial of service to Sidekiq workers by importing improperly structured CSV files in GitLab.
- 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-2026-1403?
CVE-2026-1403 is a medium-severity denial of service vulnerability in GitLab, published on 7 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.7 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that when importing CSV files could have allowed an authenticated user to cause denial of service to Sidekiq workers due to improper validation of CSV file structure.
Weakness: CWE-770
Which versions are affected by CVE-2026-1403?
1 open source package ship an affected version, including gitlab.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | From 11.7.0 | 18.8.9, 18.9.5, 18.10.3 |
How do I fix CVE-2026-1403?
Upgrade gitlab to a fixed version for your release line: 18.8.9, 18.9.5 or 18.10.3.
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-2026-1403 being exploited?
There is no known exploitation of CVE-2026-1403 in the wild and no public exploit code.
Sources
Also known as BIT-gitlab-2026-1403, GHSA-6w5v-7h2v-438h, UBUNTU-CVE-2026-1403.