On Dec. 19, 2025, MongoDB publicly disclosed MongoBleed, a security vulnerability (CVE-2025-14847) that allows unauthenticated attackers to leak sensitive heap memory by exploiting a trust issue in how MongoDB Server handles zlib-compressed network messages.
This flaw occurs prior to authentication, meaning an attacker only needs network access to the database’s default port to trigger it.
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Source: Palo Alto Unit 42
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