PostgreSQL server undersizes allocations, via integer wraparound

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CVE-2026-6473

CVE-2026-6473 affects PostgreSQL server features where integer wraparound can cause undersized allocations and write out-of-bounds. An unprivileged database user could potentially execute arbitrary code as the OS user running the database, or trigger segmentation faults with gigabyte-scale inputs...

postgresql: libpq: libpq undersizes allocations, via integer wraparound

A vulnerability has been identified in PostgreSQL’s libpq client library, where integer wraparound in several allocation-size calculations allows a peer or input provider to cause an undersized buffer and then write out-of-bounds by hundreds of megabytes. This can lead to a client application...