CVE-2025-7449
📋 TL;DR
This vulnerability allows authenticated GitLab users with specific permissions to cause a denial of service condition by exploiting HTTP response processing. It affects GitLab Community Edition and Enterprise Edition installations running vulnerable versions. The attack requires authenticated access but 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 specific GitLab components or users, potentially causing workflow interruptions.
If Mitigated
Minimal impact with proper authentication controls and monitoring; service remains available to legitimate users.
🎯 Exploit Status
Exploitation requires authenticated access and specific permissions. The HackerOne report suggests detailed knowledge of the vulnerability exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 18.4.5, 18.5.3, or 18.6.1
Vendor Advisory: https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/
Restart Required: Yes
Instructions:
1. Backup your GitLab instance and database. 2. Update to GitLab 18.4.5, 18.5.3, or 18.6.1 depending on your current version. 3. Follow GitLab upgrade documentation for your deployment method (Omnibus, source, Helm, etc.). 4. Restart GitLab services after update.
🔧 Temporary Workarounds
Restrict User Permissions
allReview and limit permissions for authenticated users to reduce attack surface.
Rate Limiting
allImplement rate limiting on HTTP endpoints to mitigate DoS attempts.
🧯 If You Can't Patch
- Implement strict access controls and monitor for unusual authentication patterns
- Deploy WAF rules to detect and block potential DoS patterns in HTTP traffic
🔍 How to Verify
Check if Vulnerable:
Check GitLab version via Admin Area 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 18.4.5, 18.5.3, or 18.6.1 or higher. Test HTTP response functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual patterns of HTTP requests from authenticated users
- Increased error rates in application logs
- Service restart events
Network Indicators:
- Spike in HTTP traffic to GitLab endpoints
- Unusual request patterns from single IPs
SIEM Query:
source="gitlab.logs" AND ("HTTP 5xx" OR "service unavailable" OR "DoS")