CVE-2025-14847
MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability - [Actively Exploited]
Description
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.
INFO
Published Date :
Dec. 19, 2025, 11:15 a.m.
Last Modified :
Jan. 13, 2026, 10:24 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
MongoDB Server contains an improper handling of length parameter inconsistency vulnerability in Zlib compressed protocol headers. This vulnerability may allow a read of uninitialized heap memory by an unauthenticated client.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://jira.mongodb.org/browse/SERVER-115508 ; https://nvd.nist.gov/vuln/detail/CVE-2025-14847
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | a39b4221-9bd0-4244-95fc-f3e2e07f1deb | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | a39b4221-9bd0-4244-95fc-f3e2e07f1deb | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update MongoDB Server to a patched version.
- Apply vendor-provided security updates.
- Ensure all affected server versions are updated.
Public PoC/Exploit Available at Github
CVE-2025-14847 has a 77 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-14847.
| URL | Resource |
|---|---|
| https://jira.mongodb.org/browse/SERVER-115508 | Issue Tracking Patch Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2025/12/29/21 | Mailing List |
| https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847 | Technical Description Third Party Advisory |
| https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server | Exploit Third Party Advisory |
| https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server | Exploit Third Party Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847 | Third Party Advisory US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-14847 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-14847
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
None
Python Dockerfile
None
YARA Python
This script is used to identify MongoDB services that are network-exposed and allow unauthenticated protocol handshakes.
Python
🛠 Exploit the CVE-2025-14847 MongoDB vulnerability to reveal sensitive information through crafted zlib-compressed packets and real-time output.
🛡️ Detect vulnerable MongoDB instances with the high-performance MongoBleed scanner for CVE-2025-14847, ensuring network security and data protection.
🔍 Scan for MongoDB vulnerabilities with MongoBleed, a high-performance tool for detecting CVE-2025-14847 across large networks quickly and efficiently.
cve-2025-14847 heap-memory-leak info-disclosure mongodb mongodb-exploit mongodb-security mongodbleed op-compressed penetration-testing red-team zlib
Python
None
Python
🔍 Exploit unauthenticated memory leaks in MongoDB, targeting the zlib decompression flaw for security research and prevention.
contributions cve-2025-14847 cve-2025-14847-poc exploit heap-memory-leak info-disclosure mongobleed mongodb mongodb-security penetration-testing pentesting python red-team ruby vulnerability
JavaScript Python
CVE-2025-14847 | MongoBleed vulnerability proof of concept project
cve-2025-14847 mongo-bleed peakcyber
Python JavaScript
None
Python
CVE-2025-14847 explaination and lab
contributions
Python
一个收集各种CVE漏洞的PoC（概念验证）或Exploit（漏洞利用）工具的仓库。旨在为安全研究、渗透测试提供参考和便利。
Go JavaScript
A Telegram bot that monitors trending CVEs from https://cvemon.intruder.io and posts them to your channel every 5 minutes.
Dockerfile Python
Full automation check for CVE-2025-14847 MonogBleed- Finds origin IP and tests for exploit.
Python
Results are limited to the first 15 repositories due to potential performance issues.
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The following table lists the changes that have been made to the
CVE-2025-14847 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Jan. 13, 2026
Action Type Old Value New Value Added Reference Type CVE: https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847 Types: Technical Description, Third Party Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Jan. 12, 2026
Action Type Old Value New Value Added Reference https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847 -
Initial Analysis by [email protected]
Dec. 31, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 4.4.30 *cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* versions from (including) 5.0.0 up to (excluding) 5.0.32 *cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:* versions from (including) 6.0.0 up to (excluding) 6.0.27 *cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:* versions from (including) 7.0.0 up to (excluding) 7.0.28 *cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:* versions from (including) 8.0.0 up to (excluding) 8.0.17 *cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:* versions from (including) 8.2.0 up to (excluding) 8.2.3 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2025/12/29/21 Types: Mailing List Added Reference Type MongoDB, Inc.: https://jira.mongodb.org/browse/SERVER-115508 Types: Issue Tracking, Patch, Vendor Advisory Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847 Types: Third Party Advisory, US Government Resource Added Reference Type CVE: https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server Types: Exploit, Third Party Advisory Added Reference Type CVE: https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server Types: Exploit, Third Party Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Dec. 31, 2025
Action Type Old Value New Value Added Reference https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server Added Reference https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Dec. 30, 2025
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Dec. 29, 2025
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2025/12/29/21 -
New CVE Received by [email protected]
Dec. 19, 2025
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-130 Added Reference https://jira.mongodb.org/browse/SERVER-115508