# CVE-2025-14847

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.

- Page: https://www.vulneraibility.com/cve/CVE-2025-14847
- CVSS: 7.5
- Known exploited: yes, in CISA KEV since 2025-12-29; CISA due date 2026-01-19
- EPSS: 83.22%
- Unvetted proof-of-concept code on GitHub: 1 Metasploit module · 42 GitHub proofs of concept · 1 Nuclei template (first 2025-07-30)
- CISA SSVC: exploitation active, automatable yes, technical impact partial (assessed 2025-12-30)
- Weakness: CWE-130
- Published: 2025-12-19

## Affected versions

- mongodb: affected >= 4.4.0 and < 4.4.30; >= 5.0.0 and < 5.0.32; >= 6.0.0 and < 6.0.27; >= 7.0.0 and < 7.0.28; >= 8.0.0 and < 8.0.17; >= 8.2.0 and < 8.2.3; fixed in 4.4.30, 5.0.32, 6.0.27, 7.0.28, 8.0.17, 8.2.3 (Bitnami advisory, via OSV)
- MongoDB Inc. MongoDB Server: affected >= 8.2 and < 8.2.3; >= 8.0 and < 8.0.17; >= 7.0 and < 7.0.28; >= 6.0 and < 6.0.27; >= 5.0 and < 5.0.32; >= 4.4 and < 4.4.30; 4.2; 4.0; 3.6

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://jira.mongodb.org/browse/SERVER-115508
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847
- [other] http://www.openwall.com/lists/oss-security/2025/12/29/21
- [other] https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server
- [other] https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server
- [other] https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.