security-phoenix-demo/mongobleed-exploit-cve-2025-14847Exploit lab, docker and code scanner for mongobleed Vulnerability CVE-2025-14847 plus Phoenix Security Sync tools
CVE-2025-14847 | CVSS 8.7 (High) | Unauthenticated Memory Disclosure
📖 Full Documentation • 🔬 Technical Analysis • ⚡ Quick Commands
MongoBleed is a critical memory disclosure vulnerability in MongoDB's network transport layer that allows unauthenticated remote attackers to exfiltrate sensitive heap memory without any credentials or user interaction.
| Category | Description |
|---|---|
| Attack Type | Remote, unauthenticated memory disclosure |
| Root Cause | Zlib decompression returns allocated buffer size instead of actual data length |
| Data Exposed | Database passwords, API keys, session tokens, AWS credentials, internal server state |
| Severity | CVSS 8.7 (High) - Network-accessible, no auth required |
| Exploitation | Active exploitation observed in the wild since Dec 28, 2025 |
| Branch | Vulnerable | Fixed | Action |
|---|---|---|---|
| 8.2.x | 8.2.0 → 8.2.2 | 8.2.3 | Upgrade immediately |
| 8.0.x | 8.0.0 → 8.0.16 | 8.0.17 | Upgrade immediately |
| 7.0.x | 7.0.0 → 7.0.27 | 7.0.28 | Upgrade immediately |
| 6.0.x | 6.0.0 → 6.0.26 | 6.0.27 | Upgrade immediately |
| 5.0.x | 5.0.0 → 5.0.31 | 5.0.32 | Upgrade immediately |
| 4.4.x | 4.4.0 → 4.4.29 | 4.4.30 | Upgrade immediately |
| ≤4.2.x | All versions | None | ⚠️ EOL - Migrate to supported version |
| Aspect | Details |
|---|---|
| What is vulnerable | MongoDB Server network transport layer using zlib compression |
| Severity | High (CVSS 8.7/7.5) |
| Impact | Unauthenticated, remote disclosure of uninitialised heap memory |
| Why it matters | Leaked fragments contain database passwords, AWS secret keys, and internal server states |
| Exploit status | Public Proof-of-Concept (PoC) "mongobleed" is validated and circulating |
| What to do today | Upgrade to patched versions immediately or disable zlib compression |
The vulnerability exists in MongoDB's network transport layer (message_compressor_zlib.cpp) where a critical flaw in the zlib decompression logic allows unauthenticated attackers to leak sensitive server memory.
// VULNERABLE CODE (before fix)
counterHitDecompress(input.length(), output.length());
return {output.length()}; // ❌ Returns ALLOCATED buffer size
// PATCHED CODE (after fix)
counterHitDecompress(input.length(), output.length());
return length; // ✅ Returns ACTUAL decompressed data length
┌─────────────────────────────────────────────────────────────────────────────┐
│ MongoBleed Attack Vector │
├─────────────────────────────────────────────────────────────────────────────┤
│ │
│ ATTACKER VULNERABLE MongoDB │
│ │ │ │
│ │ 1. Send OP_COMPRESSED message │ │
│ │ uncompressedSize: 8192 (LIE) │ │
│ │ actual data: ~100 bytes │ │
│ │────────────────────────────────────> │
│ │ │ │
│ │ 2. Allocate 8192-byte buffer │
│ │ 3. Decompress ~100 bytes │
│ │ 4. BUG: Return buffer.length() = 8192 │
│ │ 5. BSON parser reads uninitialized memory │
│ │ │ │
│ │ 6. Error response with leaked │ │
│ │ memory as "field names" │ │
│ │<──────────────────────────────────── │
│ │ │ │
│ 🔓 LEAKED DATA: │ │
│ - API keys, passwords, tokens │
│ - MongoDB internal state │
│ - WiredTiger storage configs │
│ - System /proc information │
│ - Client connection data │
│ │
└─────────────────────────────────────────────────────────────────────────────┘
| Date | Event |
|---|---|
| 15 Dec 2025 | Vulnerability identified; internal ticket SERVER-115508 |
| 19 Dec 2025 | Fix released, CVE-2025-14847 disclosed |
| 24 Dec 2025 | MongoDB Atlas fleet patched |
| 26 Dec 2025 | Public PoC "mongobleed" released |
| 28 Dec 2025 | Exploitation observed in the wild |
🔬 See Technical Analysis → for detailed vulnerability anatomy, exploit construction, and detection methods.
mongobleed-exploit-CVE-2025-14847/
├── exploit/ # 🔴 Exploit Lab
│ ├── docker-compose.yml # Vulnerable + Patched MongoDB instances
│ ├── mongobleed.py # Memory leak exploit PoC
│ ├── init/init-mongo.js # Sensitive test data
│ ├── test-exploit.sh # Lab test script
│ └── README.md # Lab documentation
│
├── scanner/ # 🌐 Network Scanner
│ ├── mongobleed_scanner.py # IP/domain vulnerability scanner
│ ├── sample-targets.txt # Sample targets file
│ └── README.md # Scanner documentation
│
├── code-scan/ # 📂 Code Scanner
│ ├── main.py # CLI entry point
│ ├── scanners/ # Docker, Python, Infra scanners
│ ├── models/ # Finding, Vulnerability models
│ ├── integrations/ # Phoenix Security upload
│ └── README.md # Code scanner documentation
│
└── original-exploit/ # 📚 Original PoC reference
cd exploit
# Start lab (vulnerable + patched instances)
docker-compose up -d
sleep 10
# Test vulnerable instance (should leak memory)
python3 mongobleed.py --host localhost --port 27017