MongoDB · MongoDB and MongoDB Server
CVE-2025-14847
Zlib compressed protocol header length confusion may allow memory read
What it is
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.
CISA: 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.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: January 19, 2026
- Added to the CISA list
- December 29, 2025
- Published
- December 19, 2025
- Severity
- High 8.7 CVSS 4.0
- Chance of attacks in the next 30 days (EPSS)
- 83% in the top 0.3% of all known vulnerabilities
- Weakness
- CWE-130
- More details
- NVD · CVE.org · CISA
All references (1)
More exploited flaws from MongoDB
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Dec 10, 2021 | Remote Code Execution | mongo-express | Critical 9.9 | 85% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.