Skip to content
CVE Tracker
  • Newest CVEsPage
  • Recently added to KEVPage
  • Rising exploitation (EPSS)Page
  • Weekly digestPage
  • StatisticsPage
  • WatchlistPage
  • API documentationPage
  • MCP serverPage
  • Data sourcesPage
  • ChangelogPage
  • AboutPage
  • How it's builtPage
Back

CVE-2026-6478

PostgreSQL discloses MD5-hashed passwords via covert timing channel

Medium6.5EPSS 0.56%
Published
Updated
Reserved
Assigned by
PostgreSQL

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.

Scores

CVSS scores of CVE-2026-6478, by who scored it
Scored byCVSSScoreVector
PostgreSQLCNA (assigner)3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
redhat-SADPADP (enrichment)3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
NVDNVD · Modified3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS (exploitation in 30 days)
0.56% · top 53% of all CVEs (5 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

Affected products

  • PostgreSQL

    • affected 18 – < 18.4
    • affected 17 – < 17.10
    • affected 16 – < 16.14
    • affected 15 – < 15.18
    • affected < 14.23

What to do

Workaround: reset password with password_encryption=scram-sha-256

References (38)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-6478 badge
[![CVE-2026-6478](https://trackcve.app/badge/CVE-2026-6478.svg)](https://trackcve.app/cve/CVE-2026-6478)

Record last updated .