This advisory covers five security vulnerabilities in PostgreSQL 18 on Red Hat Enterprise Linux 10. The issues include a heap buffer overflow in pg_trgm (CVE-2026-2007), a memory disclosure in oidvector (CVE-2026-2003), missing validation of multibyte character length allowing arbitrary code execution (CVE-2026-2006), missing validation of input type in intarray selectivity estimator allowing arbitrary code execution (CVE-2026-2004), and a heap buffer overflow in pgcrypto leading to arbitrary code execution (CVE-2026-2005). These vulnerabilities could allow attackers to execute arbitrary code or disclose memory contents. Red Hat has released updated postgresql18 packages for RHEL 10 to fix these issues.

The vulnerabilities can lead to arbitrary code execution and memory disclosure on affected systems running PostgreSQL 18 on Red Hat Enterprise Linux 10. This poses a high security risk as attackers could potentially execute malicious code with the privileges of the PostgreSQL server process or gain unauthorized access to sensitive memory contents.

Red Hat has released updated postgresql18 packages for Red Hat Enterprise Linux 10 that address these vulnerabilities. Users should apply the security update as described in the Red Hat advisory RHSA-2026:19009 to remediate these issues. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the official update.