CVE-2025-14847 MongoDB MongoDB and MongoDB Server: software flaw
In plain words: A mistake in the software that attackers have found a way to abuse. Depends on the product — see the description and the vendor advisory.
Confirmed exploited by CISA on · US federal patch deadline Jan 19, 2026
What to do
- Install MongoDB's security update for MongoDB and MongoDB Server. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability
- Product
- MongoDB MongoDB and MongoDB Server
- CISA description
- MongoDB Server contains an improper handling of length parameter inconsistency vulnerability in Zlib compressed protocol headers. This vulnerability may allow a read of uninitialized heap memory by an unauthenticated client.
- Type of flaw
- Software flaw (CWE-130)
- Confirmed exploited
- Dec 29, 2025
- US federal patch deadline
- Jan 19, 2026
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Answering about CVE-2025-14847 ·
Questions about CVE-2025-14847
Is CVE-2025-14847 being exploited?
Yes. CISA added CVE-2025-14847 to its Known Exploited Vulnerabilities catalog on Dec 29, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2025-14847?
Install MongoDB's security update for MongoDB and MongoDB Server. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2025-14847?
Only if you use MongoDB MongoDB and MongoDB Server. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.