CVE-2026-6478

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

14/05/2026

Last modified:

06/07/2026

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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): Low
Availability (A): None

Base Score 3.x

6.50

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:postgresql:postgresql::::::::		14.23 (excluding)
cpe:2.3:a:postgresql:postgresql::::::::	15.0 (including)	15.18 (excluding)
cpe:2.3:a:postgresql:postgresql::::::::	16.0 (including)	16.14 (excluding)
cpe:2.3:a:postgresql:postgresql::::::::	17.0 (including)	17.10 (excluding)
cpe:2.3:a:postgresql:postgresql::::::::	18.0 (including)	18.4 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-6478

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools