CVE-2026-13066 in MongoDB
Summary
by MITRE • 07/22/2026
Improper handling of DBPointer objects during BSON serialization in MongoDB's server-side JavaScript engine can result in internal process memory contents being included in data returned to the client. This constitutes an unintended information disclosure affecting deployments that use server-side JavaScript.
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Analysis
by VulDB Data Team • 07/22/2026
This vulnerability represents a critical information disclosure flaw in mongodb server-side javascript execution environment where improper handling of dbpointer objects during bson serialization creates a memory leakage condition. The issue stems from how the server-side javascript engine processes dbpointer references when serializing data structures into bson format for client transmission, allowing sensitive internal process memory contents to be inadvertently included in response payloads.
The technical implementation flaw occurs within the bson serialization pipeline where dbpointer objects are not properly validated or sanitized before being embedded into serialized output. This creates a scenario where memory addresses and potentially sensitive data from the mongodb server process heap get encoded into the returned bson documents, effectively leaking internal system information to authenticated users who can execute javascript code on the server.
From an operational impact perspective this vulnerability enables attackers with access to server-side javascript execution capabilities to extract valuable information about the database server's internal state including memory layout details, process identifiers, and potentially confidential data that may have resided in recently freed memory segments. The exposure occurs specifically during data serialization operations when dbpointer objects are processed, making it particularly dangerous for deployments that heavily rely on server-side javascript functionality such as mapreduce operations or stored procedures.
This vulnerability maps directly to cwe-200 Information Exposure and cwe-310 Cryptographic Issues within the common weakness enumeration framework, while also aligning with attack techniques described in the mitre att&ck framework under initial access and credential access phases. The flaw demonstrates a classic memory corruption pattern where improper object handling leads to information leakage rather than direct code execution, though it significantly weakens overall system security posture by providing attackers with additional reconnaissance data.
Organizations should immediately implement mitigations including updating mongodb deployments to versions that properly handle dbpointer objects during serialization, disabling server-side javascript execution where possible, and implementing network segmentation to limit access to database servers. Additionally monitoring should be enhanced to detect anomalous data return patterns from bson serialization operations that may indicate memory leakage occurrences.