Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

On December 19, 2025, MongoDB issued an advisory for CVE-2025-14847, known as “MongoBleed,” a high-severity vulnerability in the server’s zlib-based network compression functionality. This vulnerability affects how the database handles compressed network communications and can cause it to accidentally leak sensitive information from its memory when abused by unauthenticated threat actors. The problem occurs when MongoDB receives a specially crafted message.

A newly disclosed MongoDB vulnerability, tracked as CVE-2025-14847 and informally referred to as MongoBleed, allows unauthenticated remote attackers to leak uninitialized memory from a MongoDB server. A public proof-of-concept exploit is already available, significantly increasing the risk for exposed MongoDB deployments. This post explains how the vulnerability works, what is required to exploit it, and how ARMO helps identify exposure and detect exploitation attempts at runtime.

In the world of database security, few things are as alarming as an unauthenticated memory leak. It recalls the panic of OpenSSL’s Heartbleed - a vulnerability where a simple heartbeat request could bleed out sensitive secrets from a server's memory. Now, MongoDB users are facing their own version: CVE-2025-14847, widely dubbed "MongoBleed".

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