CVE-2026-6478
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Postgresql
PublishedMay 14, 2026
First seenMay 14, 2026
Weakness typeCWE-385CWE-385
How to fix
Update
- postgresql postgresql14.23, 15.18, 16.14, 17.10, 18.4 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:49521
- access.redhat.com/errata/RHSA-2026:27718
- access.redhat.com/errata/RHSA-2026:27743
- access.redhat.com/errata/RHSA-2026:27742
- access.redhat.com/errata/RHSA-2026:27738
- access.redhat.com/errata/RHSA-2026:28999
- access.redhat.com/errata/RHSA-2026:28208
- access.redhat.com/errata/RHSA-2026:26181
- access.redhat.com/errata/RHSA-2026:28143
- access.redhat.com/errata/RHSA-2026:44420
- access.redhat.com/errata/RHSA-2026:34362
- access.redhat.com/errata/RHSA-2026:34363
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| postgresql postgresql | v < 14.23, 15.0 ≤ v < 15.18, 16.0 ≤ v < 16.14, 17.0 ≤ v < 17.10, 18.0 ≤ v < 18.4 | 14.23, 15.18, 16.14, 17.10, 18.4 |
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