franksec42/mongobleed-exploit-cve-2025-14847Explot, Lab, Scanner - external and docker container, for SMongobleed-CVE-2025-14847 plus phoenix security uploader
CVE-2025-14847 | CVSS 8.7 (High) | Unauthenticated Memory Disclosure
CVE-2025-14847, dubbed MongoBleed, allows unauthenticated remote attackers to exfiltrate uninitialised heap memory by exploiting MongoDB's zlib decompression logic. This high-severity flaw exposes sensitive artifacts, including plain-text credentials and session tokens, providing a road map for lateral movement and full server takeover.
| 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 │
│ │
└─────────────────────────────────────────────────────────────────────────────┘
| Version | Vulnerable Range | Fixed Version | Status |
|---|---|---|---|
| 8.2.x | 8.2.0 - 8.2.2 | 8.2.3 | ✅ Patched |
| 8.0.x | 8.0.0 - 8.0.16 | 8.0.17 | ✅ Patched |
| 7.0.x | 7.0.0 - 7.0.27 | 7.0.28 | ✅ Patched |
| 6.0.x | 6.0.0 - 6.0.26 | 6.0.27 | ✅ Patched |
| 5.0.x | 5.0.0 - 5.0.31 | 5.0.32 | ✅ Patched |
| 4.4.x | 4.4.0 - 4.4.29 | 4.4.30 | ✅ Patched |
| 4.2.x | All versions | None | ⚠️ EOL |
| 4.0.x | All versions | None | ⚠️ EOL |
| 3.6.x | All versions | None | ⚠️ EOL |
| 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 |
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
# Test patched instance (should NOT leak memory)
python3 mongobleed.py --host localhost --port 27018
# Full lab test
./test-exploit.sh
cd scanner
# Scan single host
python3 mongobleed_scanner.py 192.168.1.100
# Scan network range
python3 mongobleed_scanner.py 192.168.1.0/24
# Scan from file
python3 mongobleed_scanner.py @sample-targets.txt --json --output results.json
cd code-scan
# Scan project for vulnerable MongoDB versions
python3 main.py scan /path/to/project
# Scan and upload to Phoenix
python3 main.py scan /path/to/project --upload-phoenix
# Run tests
python3 main.py test
# === EXPLOIT LAB ===
# Start lab
cd exploit && docker-compose up -d && sleep 10
# Run exploit (vulnerable instance)
python3 exploit/mongobleed.py --host localhost --port 27017
# Run exploit (patched instance - verify no leaks)
python3 exploit/mongobleed.py --host localhost --port 27018
# === NETWORK SCANNER ===
# Scan local lab
python3 scanner/mongobleed_scanner.py localhost:27017 localhost:27018
# Scan network
python3 scanner/mongobleed_scanner.py 192.168.1.0/24 --threads 20