Covert timing channel in comparison of MD5-hashed password in PostgreSQL authentication allows an attacker to recover user credentials sufficient to authenticate. This does not affect scram-sha-256 passwords, the default in all supported releases. However, current databases may have MD5-hashed passwords originating in upgrades from PostgreSQL 13 or earlier. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
The PostgreSQL project thanks Joe Conway for reporting this problem.
| Affected Version | Fixed In | Fix Published |
|---|---|---|
| 18 | 18.4 | 2026-05-14 |
| 17 | 17.10 | 2026-05-14 |
| 16 | 16.14 | 2026-05-14 |
| 15 | 15.18 | 2026-05-14 |
| 14 | 14.23 | 2026-05-14 |
For more information about PostgreSQL versioning, please visit the versioning page.
| Overall Score | 6.5 |
|---|---|
| Component | core server |
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
If you wish to report a new security vulnerability in PostgreSQL, please send an email to security@postgresql.org.
For reporting non-security bugs, please see the Report a Bug page.