Actively exploited · Published Dec 19, 2025 · Assigned by mongodb
CVE-2025-14847Zlib compressed protocol header length confusion may allow memory read
High 7.5 Exploited
In plain English
A high-severity security flaw in MongoDB Server from MongoDB Inc.. Attackers are actively exploiting it in the wild (listed by CISA on December 29, 2025). The chance it is exploited in the next 30 days is estimated at 83.2% (higher than 99.7% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Jan 19, 2026.
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MongoDB Inc. | MongoDB Server | 8.2 – before 8.2.38.0 – before 8.0.177.0 – before 7.0.286.0 – before 6.0.275.0 – before 5.0.324.4 – before 4.4.304.24.0 |
Weakness: CWE-130 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://jira.mongodb.org/browse/SERVER-115508
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847 government-resource
- http://www.openwall.com/lists/oss-security/2025/12/29/21
- https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server
- https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server
- https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847