Low · published August 13, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| postgresql/postgresql | ≥ 14.0, < 14.24 | 14.24 |
| postgresql/postgresql | ≥ 15.0, < 15.19 | 15.19 |
| postgresql/postgresql | ≥ 16.0, < 16.15 | 16.15 |
| postgresql/postgresql | ≥ 17.0, < 17.11 | 17.11 |
| postgresql/postgresql | ≥ 18.0, < 18.5 | 18.5 |