CVE-2026-6478

MEDIUM

PostgreSQL discloses MD5-hashed passwords via covert timing channel

Title source: cna

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 6.5

EPSS 0.0008

EPSS Percentile 22.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-385

Status published

Products (6)

None/PostgreSQL < 14.23

None/PostgreSQL 15 - 15.18

None/PostgreSQL 16 - 16.14

None/PostgreSQL 17 - 17.10

None/PostgreSQL 18 - 18.4

postgresql/postgresql < 14.23

Published May 14, 2026

Tracked Since May 14, 2026