CVE-2025-7259
📋 TL;DR
An authorized MongoDB user can cause a server crash by issuing queries containing duplicate _id fields, leading to denial of service. This affects MongoDB Server v8.1.0 specifically. Only authenticated users can trigger this vulnerability.
💻 Affected Systems
- MongoDB Server
📦 What is this software?
Mongodb by Mongodb
⚠️ Risk & Real-World Impact
Worst Case
Complete MongoDB service outage requiring restart, disrupting all database operations and dependent applications.
Likely Case
Service disruption affecting availability until manual intervention restarts the MongoDB process.
If Mitigated
Minimal impact with proper user access controls and monitoring preventing malicious queries.
🎯 Exploit Status
Requires authenticated access but simple query construction to trigger.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Upgrade to MongoDB Server version 8.1.1 or later
Vendor Advisory: https://jira.mongodb.org/browse/SERVER-102693
Restart Required: Yes
Instructions:
1. Backup all databases. 2. Stop MongoDB service. 3. Upgrade to MongoDB 8.1.1+. 4. Restart MongoDB service. 5. Verify successful upgrade.
🔧 Temporary Workarounds
Restrict user permissions
allLimit query permissions for non-admin users to reduce attack surface
db.revokeRolesFromUser("username", [ { role: "readWrite", db: "database" } ])
Implement query validation
allAdd application-level validation to reject queries with duplicate _id fields
🧯 If You Can't Patch
- Implement strict access controls and monitor for unusual query patterns
- Deploy MongoDB behind reverse proxy with rate limiting and query inspection
🔍 How to Verify
Check if Vulnerable:
Check MongoDB version: if exactly 8.1.0, system is vulnerableCheck Version:
mongod --versionVerify Fix Applied:
Confirm MongoDB version is 8.1.1 or higher after upgrade📡 Detection & Monitoring
Log Indicators:
- Unexpected server crashes
- Queries with duplicate _id fields in logs
- Authentication events followed by crashes
Network Indicators:
- Sudden drop in MongoDB connections
- Increased error responses from database
SIEM Query:
source="mongodb.log" AND ("Fatal" OR "assertion" OR "terminating")