What Else Is In There?
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A 1990s-era PostgreSQL contrib extension called refint shipped a critical stack buffer overflow and SQL injection vulnerability (CVE-2026-6637, CVSS 8.8) in May 2026, allowing unprivileged database users to execute arbitrary code. The immediate fix is to apply the May 14 minor releases and drop the refint extension. The deeper issue is that most teams cannot enumerate what extensions are actually installed in their production databases. Extensions persist silently across major-version upgrades, meaning forgotten modules from years-old projects remain loaded and exploitable. The post recommends running a full audit of installed extensions per database, comparing against an approved list, checking shared_preload_libraries, and establishing recurring audits. Treating PostgreSQL extensions as production supply-chain dependencies — with clear ownership, security history review, and upgrade planning — is the long-term fix.
