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
The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mongodb | Mongodb | 3.6.0 (including) | 4.4.30 (excluding) |
| Mongodb | Mongodb | 5.0.0 (including) | 5.0.32 (excluding) |
| Mongodb | Mongodb | 6.0.0 (including) | 6.0.27 (excluding) |
| Mongodb | Mongodb | 7.0.0 (including) | 7.0.28 (excluding) |
| Mongodb | Mongodb | 8.0.0 (including) | 8.0.17 (excluding) |
| Mongodb | Mongodb | 8.2.0 (including) | 8.2.3 (excluding) |
| Mongodb | Ubuntu | esm-apps/bionic | * |
| Mongodb | Ubuntu | esm-apps/focal | * |
| Mongodb | Ubuntu | upstream | * |
Potential Mitigations
Related Attack Patterns
References
- https://jira.mongodb.org/browse/SERVER-115508
- http://www.openwall.com/lists/oss-security/2025/12/29/21
- https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847
- 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.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847