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Multiple Vulnerabilities in PostgreSQL Allow for Remote Code Execution and Data Breach

Multiple vulnerabilities in PostgreSQL versions 14.x, 15.x, 16.x, 17.x and 18.x could allow for arbitrary code execution, remote denial of service, and data breach, potentially leading to complete system compromise.

Multiple vulnerabilities have been discovered in PostgreSQL, a widely-used open-source relational database management system. The vulnerabilities affect versions 14.x prior to 14.23, 15.x prior to 15.18, 16.x prior to 16.14, 17.x prior to 17.10, and 18.x prior to 18.4. Successful exploitation of these vulnerabilities could lead to arbitrary code execution, remote denial of service (DoS), data integrity issues, data breaches, and circumvention of security policies. PostgreSQL is used across a wide range of industries, making these vulnerabilities a significant concern for many organizations. Patching vulnerable systems is critical to mitigate the risks. The vulnerabilities were disclosed in the PostgreSQL security bulletin on May 14, 2026, prompting this analysis.

Attack Chain

  1. An attacker identifies a vulnerable PostgreSQL server exposed to the network.
  2. The attacker crafts a malicious SQL query designed to exploit one of the identified vulnerabilities (CVE-2026-6472, CVE-2026-6473, CVE-2026-6474, CVE-2026-6475, CVE-2026-6476, CVE-2026-6477, CVE-2026-6478, CVE-2026-6479, CVE-2026-6575, CVE-2026-6637, CVE-2026-6638).
  3. The attacker injects the malicious SQL query into the application interacting with the database.
  4. The PostgreSQL server processes the malicious query, triggering a buffer overflow or other memory corruption issue.
  5. The attacker leverages the memory corruption to inject and execute arbitrary code on the server.
  6. The attacker gains control of the PostgreSQL server process, escalating privileges if necessary.
  7. The attacker uses their access to steal sensitive data from the database or launch further attacks on the internal network.
  8. The attacker may also trigger a denial-of-service condition, disrupting database services.

Impact

Successful exploitation of these vulnerabilities could have severe consequences, including unauthorized access to sensitive data, data manipulation, service disruption, and complete system compromise. The vulnerabilities affect PostgreSQL versions 14.x, 15.x, 16.x, 17.x and 18.x, potentially impacting numerous organizations across various sectors that rely on PostgreSQL for critical business functions. The vulnerabilities can lead to data breaches, financial losses, and reputational damage.

Recommendation

  • Immediately patch all PostgreSQL instances to the latest versions (14.23, 15.18, 16.14, 17.10, 18.4 or later) as recommended in the PostgreSQL security bulletin to address CVE-2026-6472, CVE-2026-6473, CVE-2026-6474, CVE-2026-6475, CVE-2026-6476, CVE-2026-6477, CVE-2026-6478, CVE-2026-6479, CVE-2026-6575, CVE-2026-6637, and CVE-2026-6638.
  • Deploy the provided Sigma rule to detect potential exploitation attempts against PostgreSQL servers by monitoring for SQL injection patterns in application logs.
  • Review and harden PostgreSQL server configurations based on security best practices to minimize the attack surface.

Detection coverage 2

Detect SQL Injection Attempts in PostgreSQL Logs

high

Detects potential SQL injection attempts in PostgreSQL logs by searching for common SQL syntax and keywords.

sigma tactics: initial_access techniques: T1190 sources: webserver

Detect Potential Exploitation of PostgreSQL CVEs via Error Messages

medium

Detects potential exploitation attempts of PostgreSQL vulnerabilities by monitoring webserver logs for specific error messages indicative of SQL injection or other exploitation techniques.

sigma tactics: initial_access techniques: T1190 sources: webserver

Detection queries are available on the platform. Get full rules →