CVE-2026-6637 – PostgreSQL refint allows stack buffer overflow and SQL injection

CVE ID :CVE-2026-6637

Published : May 14, 2026, 2:16 p.m. | 42 minutes ago

Description :Stack buffer overflow in PostgreSQL module “refint” allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a “refint” cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

Severity: 8.8 | HIGH

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