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.
Version Information
| Affected branch | Introduced | Fixed In | Fix Published |
|---|---|---|---|
| 14 | — | 14.24 | 2026-08-13 |
| 15 | — | 15.19 | 2026-08-13 |
| 16 | — | 16.15 | 2026-08-13 |
| 17 | — | 17.11 | 2026-08-13 |
| 18 | — | 18.6 | 2026-08-13 |
CVSS 3.0
| Overall Score | 3.8 |
|---|---|
| Component | client |
| Vector | AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L |
First published: 2026-08-13
Historical source observations
These dated records preserve the original source claims separately from the reviewed fix list.
center · 2026-10-03 12:08:35.169032+08
- PostgreSQL 18 · Original minor coordinate: 6
- PostgreSQL 17 · Original minor coordinate: 11
- PostgreSQL 16 · Original minor coordinate: 15
- PostgreSQL 15 · Original minor coordinate: 19
- PostgreSQL 14 · Original minor coordinate: 24
pgweb · 2026-10-03 12:08:55.967155+08
- PostgreSQL 18 · Original minor coordinate: 6
- PostgreSQL 17 · Original minor coordinate: 11
- PostgreSQL 16 · Original minor coordinate: 15
- PostgreSQL 15 · Original minor coordinate: 19
- PostgreSQL 14 · Original minor coordinate: 24