Historical catalog analysis: CISA added this entry on December 29, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2025-14847 is an improper handling of length parameter inconsistency (CWE-130) within MongoDB and MongoDB Server. The flaw exists in the processing of Zlib compressed protocol headers. If exploited, this vulnerability could allow an unauthenticated client to read uninitialized heap memory from the affected system.
Exposure and applicability
This vulnerability affects deployments of MongoDB and MongoDB Server that utilize Zlib compressed protocol headers. Because the flaw allows for unauthenticated access, any instance exposed to untrusted networks or containing unauthorized internal users is at higher risk.
Infrastructure owners should note that this vulnerability may reside in open-source components, third-party libraries, or proprietary implementations of the MongoDB protocol, meaning exposure may extend beyond standard standalone installations to integrated third-party products.
Remediation priorities
Our analysis suggests prioritizing remediation based on the network visibility of the MongoDB instances. The following actions are recommended:
- Identify and Update Affected Assets: Prioritize instances that are internet-facing or reside in shared environments. Apply mitigations according to vendor instructions.
- Cloud Service Review: For organizations utilizing MongoDB via cloud service providers, review configurations against BOD 22-01 guidance to ensure the provider has applied necessary mitigations.
- Decommissioning: In scenarios where vendor mitigations are unavailable or cannot be applied due to legacy constraints, discontinue use of the affected product version to eliminate the exposure path.
How to validate remediation
Verification must go beyond a simple version check, as the vulnerability may exist in various implementations of the protocol headers.
Defenders should verify that the specific vendor-recommended mitigation has been successfully deployed and is active in the runtime environment. Validation evidence should include confirmation from the vendor’s official guidance that the length parameter inconsistency in Zlib compressed headers has been resolved. A successful validation confirms that the unauthenticated read path is closed, though it does not eliminate all risks associated with heap memory management.
Limits and open questions
It remains unknown whether this vulnerability has been utilized in known ransomware campaigns. Additionally, while the flaw is identified in Zlib compressed protocol headers, the full extent of affected third-party libraries or proprietary implementations using these headers is not explicitly detailed in the source. Residual risk persists if compensating controls are used instead of a direct patch, as those controls may only limit access rather than resolve the underlying memory handling flaw.
Source and editorial note
CVE-2025-14847: MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability · Source date: December 29, 2025 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: January 01, 2026. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 24, 2026 at 00:38 UTC.
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