CVE-2026-6478

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.

PUBLISHED Reserved 2026-04-17 | Published 2026-05-14 | Updated 2026-05-14 | Assigner PostgreSQL

Problem types

Covert Timing Channel

Credits

The PostgreSQL project thanks Joe Conway for reporting this problem.

References

www.postgresql.org/support/security/CVE-2026-6478/

cve.org (CVE-2026-6478)

nvd.nist.gov (CVE-2026-6478)

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