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🍃 Overview

CVE-2025-14847, known as MongoBleed, is a security vulnerability affecting MongoDB Server's handling of compressed network messages. Under vulnerable conditions, an unauthenticated remote attacker may be able to disclose portions of uninitialized heap memory, potentially exposing sensitive information.

Attribute	Details
CVE ID	CVE-2025-14847
Name	MongoBleed
Vendor	MongoDB
Product	MongoDB Server
Vulnerability Type	Memory Disclosure
Attack Vector	Network
Authentication	May not be required
Primary Impact	Confidentiality and information exposure

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🍃 Technical Details

The vulnerability involves the handling of compressed network messages, including messages using zlib compression. Under certain conditions, improper memory handling can result in the disclosure of uninitialized heap memory.

Potentially exposed information depends on the contents of the affected server's memory and the conditions under which the vulnerability is triggered.

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Conceptual Overview

Remote Client
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     v
Compressed Network Message
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     v
MongoDB Server
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     v
Vulnerable Memory Handling
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     v
Potential Heap Memory Disclosure
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     v
Possible Sensitive Information Exposure

This diagram illustrates the general vulnerability concept and is not a verified exploit sequence.

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🍃 Security Impact

Potential consequences include:

• Disclosure of uninitialized heap memory.
• Exposure of sensitive information held in server memory.
• Increased confidentiality risk for network-accessible MongoDB deployments.
• Potential leakage of data belonging to active database operations.

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🍃 Affected Versions

MongoDB releases in multiple version branches have been affected. Refer to the official security advisory to confirm the affected versions and corresponding fixes for your deployment.

Consult the MongoDB Security page for authoritative remediation guidance.

🍃 Detection and Verification

Check the installed version

mongod --version

Check service status

sudo systemctl status mongod

Check listening network ports

sudo ss -lntp | grep ':27017'

Compare the installed version with the vendor's advisory. An exposed port alone does not establish that a system is vulnerable.

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🍃 Mitigation

1. Upgrade MongoDB Server to a fixed release appropriate for your version branch.
2. Restrict database access to trusted hosts and networks.
3. Review the vendor's guidance regarding zlib network compression and applicable workarounds.
4. Monitor database logs and network activity for suspicious behavior.
5. Verify the installed version and confirm that the security update has been applied.

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🍃 References

• NVD — CVE-2025-14847
• MongoDB Security
• MongoDB Documentation

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🍃 Disclaimer

This repository is intended for educational purposes, defensive security research, and authorized security testing.

Only test systems you own or have explicit permission to assess. Verify technical details and remediation guidance against official vendor documentation.

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MongoBleed — Understand the risk. Verify exposure. Apply the fix.