This vulnerability involves an integer overflow in PostgreSQL server features that results in undersized memory allocation and subsequent out-of-bounds writes. An attacker with low privileges can exploit this by passing extremely large inputs to vulnerable database functions, potentially executing arbitrary code with the privileges of the database OS user or causing a denial of service through segmentation faults. Default security features such as SELinux, ASLR, and NX mitigate the risk of arbitrary code execution. The issue is tracked as CWE-190 (Integer Overflow or Wraparound). Red Hat has issued patches for affected versions and recommends validating input sizes to mitigate the risk.

The vulnerability allows an attacker with minimal database access to cause memory corruption via integer overflow, leading to out-of-bounds writes. This can result in arbitrary code execution with the operating system user privileges running the database or cause denial of service through segmentation faults. However, default security mechanisms like SELinux, ASLR, and NX reduce the likelihood of successful code execution. The CVSS v3.1 base score is 8.8 (high severity), reflecting high impact on confidentiality, integrity, and availability.

Red Hat has released official security updates that fix this vulnerability. Users should apply these updates promptly. Additionally, it is recommended to validate the length of data and object sizes on all client APIs and web interfaces, and to block, drop, or truncate oversized string, array, or binary objects before they reach backend SQL queries. Default security features such as SELinux enforcement, ASLR, and NX stack protection also help mitigate the impact.