CVE-2026-6478 – PostgreSQL discloses MD5-hashed passwords via covert timing channel

CVE ID :CVE-2026-6478

Published : May 14, 2026, 2:16 p.m. | 42 minutes ago

Description :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.

Severity: 6.5 | MEDIUM

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