CVE-2026-1456 Allocation of Resources Without Limits or Throttling in GitLab
An unauthenticated attacker can cause denial of service via CPU exhaustion by submitting specially crafted markdown files to 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-2026-1456?
CVE-2026-1456 is a medium-severity denial of service vulnerability in Gitlab Gitlab, published on 11 Feb 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 18.7 before 18.7.4, and 18.8 before 18.8.4 that could have allowed an unauthenticated user to cause denial of service through CPU exhaustion by submitting specially crafted markdown files that trigger exponential processing in markdown preview.
Weakness: CWE-770
Which versions are affected by CVE-2026-1456?
1 open source package ship an affected version, including gitlab. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
gitlab Bitnami | From 18.7.0 | 18.7.4, 18.8.4 |
Products include Gitlab Gitlab.
How do I fix CVE-2026-1456?
Upgrade gitlab to a fixed version for your release line: 18.7.4 or 18.8.4.
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-2026-1456 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1456 exists.
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-2026-1456, GHSA-w487-9r9p-6p96, MINI-4q87-245q-3x7c, MINI-5c55-49cp-fm5x, MINI-5h5f-gcq5-8rvw, MINI-9579-wg8f-xj83 and 5 more.