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.
| 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.