Threat Advisory

MongoDB Server Vulnerability Allows Memory Disclosure

Threat: Vulnerability
Targeted Region: Global
Targeted Sector: Technology & IT
Criticality: High
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EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in MongoDB Server versions 7.0, 8.0, 8.2, and 8.3. The flaws span use‑after‑free bugs, memory disclosure, uncontrolled recursion, and aggregation logic errors, resulting in remote crashes, data corruption, and potential leakage of process memory. Because MongoDB often underpins critical business applications and data pipelines, these weaknesses could cause service interruptions, loss of data integrity, and compliance violations. The combination of unauthenticated and authenticated attack vectors increases the overall threat landscape, demanding immediate attention from organizations that rely on affected deployments.[/subscribe_to_unlock_form]

EXECUTIVE SUMMARY:

Multiple security vulnerabilities have been identified in MongoDB Server versions 7.0, 8.0, 8.2, and 8.3. The flaws span use‑after‑free bugs, memory disclosure, uncontrolled recursion, and aggregation logic errors, resulting in remote crashes, data corruption, and potential leakage of process memory. Because MongoDB often underpins critical business applications and data pipelines, these weaknesses could cause service interruptions, loss of data integrity, and compliance violations. The combination of unauthenticated and authenticated attack vectors increases the overall threat landscape, demanding immediate attention from organizations that rely on affected deployments.[emaillocker id="1283"]

  • CVE-2026-11933 with a CVSS score of 8.7 – A use‑after‑free bug in the server‑side JavaScript engine that an authenticated user with read privileges can trigger via $where or $function calls, potentially leaking memory or crashing the server.
  • CVE-2026-9740 with a CVSS score of 8.7 – An unauthenticated attacker can send a crafted BSON message exploiting uncontrolled recursion in validation logic, causing the mongod process to crash.
  • CVE-2026-9750 with a CVSS score of 7.1 – Allows an authenticated user to corrupt internal metadata, leading to crashes or incorrect query results.
  • CVE-2026-9743 with a CVSS score of 7.1 – Exploits a null sub‑pipeline during aggregation; a crafted getMore call can bring the server offline.

The aggregate risk is high, with the potential for both denial‑of‑service and data exposure, especially given that one flaw requires no authentication. Exploitation could disrupt critical services, damage data reliability, and expose organizations to regulatory and financial repercussions, underscoring the urgency of addressing these vulnerabilities.

RECOMMENDATION:

  • We recommend you to update MongoDB Server to version 8.0.26, 8.2.11 and 8.3.4.

REFERENCES:

The following reports contain further technical details:
https://securityonline.info/mongodb-server-vulnerability/

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