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MongoBleed (CVE-2025-14847) Now Exploited in the Wild: MongoDB Servers at Critical Risk

## Cybersecurity: MongoDB Vulnerability Update

LBy Leo UnderwoodDec 29, 20252 min read

Cybersecurity: MongoDB Vulnerability Update

A high-severity vulnerability called MongoBleed has been identified in MongoDB Server. This unauthenticated information-leak vulnerability is actively being exploited in real-world scenarios.

The vulnerability, designated as CVE-2025-14847 , affects multiple supported and legacy versions of MongoDB Server. It allows unauthenticated remote attackers to exfiltrate sensitive data and authentication credentials.

MongoBleed is caused by improper handling of length fields in the zlib-based network message decompression logic of MongoDB Server, which occurs before authentication checks. Malformed compressed network packets can lead to the server returning uninitialized heap memory fragments to the client.

The vulnerability's root cause is identified in message_compressor_zlib.cpp , where the code returns the allocated buffer size instead of the decompressed data length, leading to potential exposure of sensitive information.

This flaw poses an immediate risk to Internet-exposed MongoDB servers as it is accessible before authentication and requires no user interaction. Approximately 87,000 potentially vulnerable instances have been identified globally, with 42% of cloud environments hosting at least one vulnerable instance.

A high-severity vulnerability called MongoBleed has been identified in MongoDB Server.
Leo Underwood · Thehackingpost

A working exploit was made publicly available on December 26, 2025, with confirmed exploitation occurring shortly thereafter. Threat actors are targeting internet-facing MongoDB deployments across both cloud and on-premise environments.

MongoBleed affects a wide range of MongoDB Server versions:

8.2.x: Affected versions: 8.2.0 through 8.2.2. Fixed in version: 8.2.3 or later. 8.0.x: Affected versions: 8.0.0 through 8.0.16. Fixed in version: 8.0.17 or later. 7.0.x: Affected versions: 7.0.0 through 7.0.27. Fixed in version: 7.0.28 or later. 6.0.x: Affected versions: 6.0.0 through 6.0.26. Fixed in version: 6.0.27 or later. 5.0.x: Affected versions: 5.0.0 through 5.0.31. Fixed in version: 5.0.32 or later. 4.4.x: Affected versions: 4.4.0 through 4.4.29. Fixed in version: 4.4.30 or later. 4.2.x, 4.0.x, 3.6.x: All versions affected. No fixed versions available.

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The vulnerability also affects certain Linux distribution packages of rsync that utilize zlib, although exploitation details for rsync remain undetermined.

Organizations should prioritize patching the vulnerability and implement configuration, network, and monitoring controls to mitigate exposure and detect potential abuse. The MongoBleed Detector tool is available to identify likely exploitation of CVE-2025-14847.

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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