CVE-2025-14847 MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency
An unauthenticated attacker can read uninitialized heap memory via mismatched length fields in Zlib compressed protocol headers.
- Exploited in the wild
- Since 29 Dec 2025
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-14847?
CVE-2025-14847 is a high-severity vulnerability in Mongodb Mongodb, published on 19 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Mismatched length fields in Zlib compressed protocol headers may allow a read of uninitialized heap memory by an unauthenticated client. This issue affects all MongoDB Server v7.0 prior to 7.0.28 versions, MongoDB Server v8.0 versions prior to 8.0.17, MongoDB Server v8.2 versions prior to 8.2.3, MongoDB Server v6.0 versions prior to 6.0.27, MongoDB Server v5.0 versions prior to 5.0.32, MongoDB Server v4.4 versions prior to 4.4.30, MongoDB Server v4.2 versions greater than or equal to 4.2.0, MongoDB Server v4.0 versions greater than or equal to 4.0.0, and MongoDB Server v3.6 versions greater than or equal to 3.6.0.
Weakness: CWE-130
Which versions are affected by CVE-2025-14847?
1 open source package ship an affected version, including mongodb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mongodb Bitnami | From 4.4.0 | 4.4.30, 5.0.32, 6.0.27, 7.0.28, 8.0.17, 8.2.3 |
Products include Mongodb Mongodb.
How do I fix CVE-2025-14847?
Upgrade mongodb to a fixed version for your release line: 4.4.30, 5.0.32, 6.0.27 or 7.0.28. US federal agencies must fix it by 19 Jan 2026.
Is CVE-2025-14847 being exploited?
Yes. Attackers have exploited CVE-2025-14847 in the wild since at least 29 Dec 2025.
Public exploit code: 1 Metasploit module, 1 Nuclei template and 41 proofs of concept on GitHub.
Other vulnerabilities in Mongodb Mongodb
- CVE-2026-82067 Auth bypass in MongoDB Server
- CVE-2026-13072 MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption
- CVE-2017-15535 Denial of service in n/a
- CVE-2026-18691 Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
- CVE-2024-1351 MongoDB Server may allow successful untrusted connection
Sources
Also known as BIT-mongodb-2025-14847, CLEANSTART-2026-KV44579, CLSA-2026-1773757893, CLSA-2026-1773768694, GHSA-4742-mr57-2r9j, MINI-q86m-mrfj-hqf8 and 3 more.