MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability
MongoDB Inc. — MongoDB Server
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.
7.5
83.2%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Published
- Dec 19, 2025
- Modified
- Jun 17, 2026
- Added to KEV
- Dec 29, 2025
- Federal patch due
- Jan 19, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
8 foundWeaponization
Public repositories whose name or description references CVE-2025-14847, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- Black1hp/mongobleed-scanner★ 35
MongoDB CVE-2025-14847 Heap Memory Leak Scanner | OP_COMPRESSED zlib Vulnerability | Bug Bounty & Red Team Tool
updated Jul 8, 2026
- cybertechajju/CVE-2025-14847_Expolit★ 34
a critical memory disclosure vulnerability in MongoDB's zlib compression handling. This tool allows security researchers to extract sensitive data from vulnerable MongoDB instances.
updated Aug 20, 2026
- ProbiusOfficial/CVE-2025-14847★ 26
poc for CVE-2025-14847
updated Jun 28, 2026
- onewinner/CVE-2025-14847★ 14
MongoDB 内存泄露漏洞 (CVE-2025-14847) 检测工具
updated Mar 6, 2026
- Security-Phoenix-demo/mongobleed-exploit-CVE-2025-14847★ 13
Exploit lab, docker and code scanner for mongobleed Vulnerability CVE-2025-14847 plus Phoenix Security Sync tools
updated Jun 8, 2026
- joshuavanderpoll/CVE-2025-14847★ 4
CVE-2025-14847 (MongoBleed)
updated Aug 19, 2026
- codeb0ssx/CVE-2025-14847-PoC★ 4
Academic proof-of-concept demonstrating CVE-2025-14847 for authorized security research.
updated May 25, 2026
- franksec42/mongobleed-exploit-CVE-2025-14847★ 3
Explot, Lab, Scanner - external and docker container, for SMongobleed-CVE-2025-14847 plus phoenix security uploader
updated Feb 28, 2026
References
Frequently asked questions
What is 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.
How severe is CVE-2025-14847?
CVE-2025-14847 has a CVSS base score of 7.5 out of 10 (CVSS 3.1).
Is CVE-2025-14847 actively exploited in the wild?
Yes. CVE-2025-14847 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Dec 29, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2025-14847?
83.2% - meaning FIRST.org's EPSS model estimates a 83.2% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2025-14847?
We found 8 public GitHub repositories referencing CVE-2025-14847, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2025-14847?
CVE-2025-14847 is classified under CWE-130 (CWE-130: Improper Handling of Length Parameter Inconsistency).
Cross-checked against
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