CVE-2026-6478

CVE Details

Release Date:	2026-05-14
Impact:	Important	What is this?

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.

See more information about CVE-2026-6478 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	8.2
Vector String:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Version:	3.1
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	Low
Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (pg_repack)	ELSA-2026-26181	2026-06-19
Oracle Linux version 8 (pgaudit)	ELSA-2026-26181	2026-06-19
Oracle Linux version 8 (postgres-decoderbufs)	ELSA-2026-26181	2026-06-19
Oracle Linux version 8 (postgresql)	ELSA-2026-26181	2026-06-19