CVE-2025-13928
📋 TL;DR
This vulnerability allows unauthenticated attackers to cause denial of service on GitLab instances by exploiting incorrect authorization validation in API endpoints. It affects all GitLab Community Edition and Enterprise Edition installations running vulnerable versions. The attack requires no authentication and can disrupt GitLab service availability.
💻 Affected Systems
- GitLab Community Edition
- GitLab Enterprise Edition
📦 What is this software?
Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →Gitlab by Gitlab
GitLab is a complete DevOps platform providing source code management, CI/CD pipelines, security scanning, container registry, and collaboration tools used by millions of developers and thousands of enterprises worldwide. As both a cloud-hosted SaaS offering (GitLab.com) and self-managed software, G...
Learn more about Gitlab →⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability for all GitLab users, disrupting code repositories, CI/CD pipelines, and collaboration features until service is restored.
Likely Case
Partial or intermittent service degradation affecting GitLab API functionality and potentially web interface responsiveness.
If Mitigated
Minimal impact with proper rate limiting, WAF rules, and network segmentation in place to block unauthenticated API abuse.
🎯 Exploit Status
The vulnerability requires no authentication and targets API endpoints, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 18.6.4, 18.7.2, or 18.8.2
Vendor Advisory: https://about.gitlab.com/releases/2026/01/21/patch-release-gitlab-18-8-2-released/
Restart Required: Yes
Instructions:
1. Backup your GitLab instance. 2. Update to GitLab 18.6.4, 18.7.2, or 18.8.2 using your preferred method (Omnibus, Helm, source). 3. Restart GitLab services. 4. Verify the update was successful.
🔧 Temporary Workarounds
Rate Limiting Configuration
linuxImplement strict rate limiting on unauthenticated API endpoints to reduce DoS impact
# Configure in GitLab configuration file
nginx['limit_req_zone'] = '$binary_remote_addr zone=gitlab_api:10m rate=10r/s'
# Add to nginx configuration for GitLab
limit_req zone=gitlab_api burst=20 nodelay;
Network Access Control
linuxRestrict access to GitLab API endpoints from untrusted networks
# Example iptables rule to restrict API access
sudo iptables -A INPUT -p tcp --dport 80 -m string --string "/api/" --algo bm -j DROP
# Or restrict to internal networks only
sudo iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 --dport 443 -j ACCEPT
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block suspicious API requests patterns
- Deploy GitLab behind a reverse proxy with request filtering and rate limiting capabilities
🔍 How to Verify
Check if Vulnerable:
Check GitLab version via admin interface or command: sudo gitlab-rake gitlab:env:info | grep 'GitLab version'Check Version:
sudo gitlab-rake gitlab:env:info | grep 'GitLab version'Verify Fix Applied:
Confirm version is 18.6.4, 18.7.2, or 18.8.2 or higher using version check command📡 Detection & Monitoring
Log Indicators:
- High volume of 401/403 responses from API endpoints
- Unusual spike in requests to /api/* paths from single IPs
- Increased error rates in production.log or api_json.log
Network Indicators:
- Abnormal traffic patterns to GitLab API endpoints
- Multiple rapid requests to authorization endpoints from unauthenticated sources
SIEM Query:
source="gitlab.logs" AND (uri_path="/api/*" AND response_code IN (401,403)) | stats count by src_ip