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Mongobleed PoC Exploit Tool Released for MongoDB Flaw that Exposes Sensitive Data

A proof-of-concept (PoC) exploit named "mongobleed" has been identified for CVE-2025-14847 , a critical unauthenticated memory leak vulnerability in MongoDB's zlib decompression handling.

ZBy Zachary BurnsDec 27, 20251 min read

A proof-of-concept (PoC) exploit named "mongobleed" has been identified for CVE-2025-14847 , a critical unauthenticated memory leak vulnerability in MongoDB's zlib decompression handling.

This vulnerability allows attackers to remotely extract uninitialized data without requiring credentials, potentially exposing internal logs and system statistics. The flaw arises from MongoDB's handling of compressed messages, where a crafted message with an inflated "uncompressedSize" prompts MongoDB to allocate a large buffer, leading to the interpretation of uninitialized memory as valid data.

By sending malformed BSON documents, the exploit systematically scans memory regions, revealing sensitive information such as MongoDB WiredTiger configurations, system memory statistics, Docker paths, connection UUIDs, and client IPs.

The following MongoDB versions are affected by this vulnerability:

Extended scans can reach up to 50,000 offsets for more extensive data leakage.
Zachary Burns · Thehackingpost

Version 8.2.x: 8.2.0 – 8.2.2 (fixed in 8.2.3) Version 8.0.x: 8.0.0 – 8.0.16 (fixed in 8.0.17) Version 7.0.x: 7.0.0 – 7.0.27 (fixed in 7.0.28) Version 6.0.x: 6.0.0 – 6.0.26 (fixed in 6.0.27) Version 5.0.x: 5.0.0 – 5.0.31 (fixed in 5.0.32)

The Python-based tool for this exploit is straightforward to deploy, with basic usage scanning offsets 20-8192: python3 mongobleed.py --host <target> . Extended scans can reach up to 50,000 offsets for more extensive data leakage.

Example outputs include system metrics such as "MemAvailable: 8554792 kB" and network statistics. A Docker Compose setup is provided for testing, illustrating the vulnerability's reproducibility with leaked data totaling over 8,700 bytes across multiple fragments.

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MongoDB has patched this issue by validating decompressed lengths before processing buffers. Organizations using MongoDB in web applications, analytics, and NoSQL stacks should apply these patches promptly, disable unauthenticated access, and monitor for unusual activity on port 27017.

The repository for this exploit has been released to increase awareness. Such vulnerabilities underscore the significance of addressing decompression bugs as a growing threat in database security.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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