CVE-2025-0755
📋 TL;DR
A buffer overflow vulnerability in MongoDB's C driver library (libbson) allows attackers to cause segmentation faults and application crashes by creating BSON documents exceeding maximum size limits. This affects MongoDB servers using vulnerable libbson versions and applications using the C driver directly. The vulnerability can lead to denial of service and potential remote code execution in worst-case scenarios.
💻 Affected Systems
- MongoDB Server
- libbson (MongoDB C Driver)
📦 What is this software?
Libbson by Mongodb
Mongodb by Mongodb
Mongodb by Mongodb
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, or ransomware deployment
Likely Case
Denial of service through application crashes, disrupting database operations and dependent services
If Mitigated
Limited impact with proper input validation and size checking in application code
🎯 Exploit Status
Exploitation requires crafting specific BSON documents that trigger the buffer overflow. The vulnerability is in the C driver library, making exploitation more complex than typical web vulnerabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: libbson 1.27.5, MongoDB Server 8.0.1, MongoDB Server 7.0.16
Vendor Advisory: https://jira.mongodb.org/browse/CDRIVER-5601
Restart Required: No
Instructions:
1. Update libbson to version 1.27.5 or later using your package manager (apt-get upgrade libbson, yum update libbson, etc.). 2. Update MongoDB Server to version 8.0.1 or 7.0.16 depending on your major version. 3. Recompile and redeploy any applications using the C driver with the updated library.
🔧 Temporary Workarounds
Input validation and size checking
allImplement application-level validation to ensure BSON documents do not exceed maximum size limits before passing to bson_append functions
Network filtering and rate limiting
allImplement network controls to limit large BSON document submissions and filter suspicious database operations
🧯 If You Can't Patch
- Implement strict input validation in application code to reject BSON documents approaching INT32_MAX size
- Deploy MongoDB behind application firewalls with BSON document size inspection capabilities
🔍 How to Verify
Check if Vulnerable:
Check libbson version with: pkg-config --modversion libbson-1.0. For MongoDB: mongod --versionCheck Version:
pkg-config --modversion libbson-1.0 && mongod --version 2>/dev/null | grep 'db version'Verify Fix Applied:
Confirm version numbers: libbson >= 1.27.5, MongoDB Server >= 8.0.1 or >= 7.0.16📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in application logs
- MongoDB crash logs
- Unusually large BSON document operations
Network Indicators:
- Large BSON document submissions exceeding normal size patterns
- Multiple failed connection attempts after crashes
SIEM Query:
source="mongodb.log" AND ("segmentation fault" OR "SIGSEGV" OR "crash" OR "buffer overflow")