CVE-2026-16241

Integer underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of service against the ECPG client via sending a bytea value lacking the mandatory prefix. The client overwrites a huge memory region with bytes outside attacker knowledge or control. This typically yields a simple SIGSEGV, but rare cases might achieve client-specific integrity impact via the write. Versions before PostgreSQL 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.

• postgresql postgresql (>= 14.0 < 14.24) • postgresql postgresql (>= 15.0 < 15.19) • postgresql postgresql (>= 16.0 < 16.15) • postgresql postgresql (>= 17.0 < 17.11) • postgresql postgresql (>= 18.0 < 18.5)