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ECPG assumes that any bytea data it receives from a backend starts with '\x' as its first two bytes, but a check was missed to enforce that. A rogue server sending some garbage bytea data would be able to crash a client, resulting in a client-side DoS, in the most common cases. Reported-by: ylwangtju <ylwangtju@qq.com> Backpatch-through: 14 Security: CVE-2026-16241