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.
8.7
83.2%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality (Vulnerable System)
- High
- Integrity (Vulnerable System)
- None
- Availability (Vulnerable System)
- None
- Confidentiality (Subsequent System)
- None
- Integrity (Subsequent System)
- None
- Availability (Subsequent System)
- None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- Published
- Dec 19, 2025
- Modified
- Feb 26, 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
Proof-of-concept & exploitation references
Weaponization
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.
No public GitHub repositories referencing CVE-2025-14847 were found at last check. Absence here is not proof no exploit exists — see the references below for vendor advisories and write-ups.
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 8.7 out of 10 (CVSS 4.0).
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).
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
Impactr finds and proves whether CVE-2025-14847 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.