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Critical Vulnerability “MongoBleed” (CVE-2025-14847) found

6 January 2026
The newly disclosed vulnerability CVE-2025-14847 (“MongoBleed”) affects multiple MongoDB Server versions worldwide. It allows unauthenticated attackers to extract sensitive memory data directly from server RAM. With active exploitation confirmed, immediate action is required.

Why Is MongoBleed Critical?

MongoBleed affects MongoDB’s network layer before authentication.Attackers only need network access to the default MongoDB port TCP/27017.The flaw abuses improper handling of zlib-compressed network messages and may expose:
  • Credentials
  • API keys and tokens
  • Session data
  • Personally identifiable information (PII)

Active Exploitation Confirmed

This is not theoretical:Public PoC available since December 2025Added to the CISA Known Exploited Vulnerabilities Catalog
  • Over 140,000 exposed MongoDB instances identified
  • Attacks are automated and executed at scale.
Who Is Affected? You may be vulnerable if you run self-hosted MongoDB servers using:

Vulnerable Versions:

    • 8.2.0 – 8.2.2
    • 8.0.0 – 8.0.16
    • 7.0.0 – 7.0.27
    • 6.0.0 – 6.0.26
    • 5.0.0 – 5.0.31
    • 4.4.0 – 4.4.29

End-of-Life (no patches):

    • 4.2, 4.0, 3.6
MongoDB Atlas customers were patched automatically. Self-hosted deployments must be updated manually.

Protection With Clue Application Protection

Customers with CLUE Application Protection are already protected against known MongoBleed attack patterns. Our protection includes:
    • Real-time detection of protocol anomalies
    • Blocking of harmful network packets
    • Operational protection buffer for secure patching

What You Should Do Now

Patch Immediately

MongoDB recommends upgrading to:
    • 8.2.3
    • 8.0.17
    • 7.0.28
    • 6.0.27
    • 5.0.32
    • 4.4.30

Temporary Mitigations (If Patching Is Delayed)

    • Do not expose MongoDB to the public internet
    • Restrict access to private networks or VPNs
    • zDisable zlib compression or switch to snappy/zstd

Official Sources

Need Help?

Our security team can assist with:
    • Exposure-Analysis
    • Protection validation
    • Secure patch coordination
Contact CLUE Cyber Secure — we protect your applications before attackers act.

Get in touch

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