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CVE-2026-6478

35
FAUCET Score

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.

First published: May 14, 2026Last modified: May 14, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 14.23CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
>= 15.0, < 15.18CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
>= 16.0, < 16.14CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
>= 17.0, < 17.10CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
>= 18.0, < 18.4CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.56%
Probability of exploitation in next 30 days
EPSS Percentile
43.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0056 is in the 20th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: 21340-17084Fixed in: 16.14-1
microsoftpatch availablevia msrc
Product: azl3 postgresql 16.12-1 on Azure Linux 3.0Fixed in: 16.14-1
ubuntupatch availablevia ubuntu_usn
Product: postgresql-14 (jammy)Fixed in: 14.23-0ubuntu0.22.04.1
ubuntupatch availablevia ubuntu_usn
Product: postgresql-16 (noble)Fixed in: 16.14-0ubuntu0.24.04.1
ubuntupatch availablevia ubuntu_usn
Product: postgresql-17 (questing)Fixed in: 17.10-0ubuntu0.25.10.1
ubuntupatch availablevia ubuntu_usn
Product: postgresql-18 (resolute)Fixed in: 18.4-0ubuntu0.26.04.1

Vendor Advisories (2)

ubuntuUSN-8294-1

PostgreSQL vulnerabilities

May 21, 2026
microsoft2026-May/CVE-2026-6478Moderate

PostgreSQL discloses MD5-hashed passwords via covert timing channel

May 12, 2026

References

access.redhat.com / errata/RHSA-2026:21182
access.redhat.com / errata/RHSA-2026:22878
access.redhat.com / errata/RHSA-2026:26181
access.redhat.com / errata/RHSA-2026:26203
access.redhat.com / errata/RHSA-2026:26204
access.redhat.com / errata/RHSA-2026:26524
access.redhat.com / errata/RHSA-2026:26525
access.redhat.com / errata/RHSA-2026:26561
access.redhat.com / errata/RHSA-2026:27718
access.redhat.com / errata/RHSA-2026:27738
access.redhat.com / errata/RHSA-2026:27741
access.redhat.com / errata/RHSA-2026:27742
access.redhat.com / errata/RHSA-2026:27743
access.redhat.com / errata/RHSA-2026:28037
access.redhat.com / errata/RHSA-2026:28143
access.redhat.com / errata/RHSA-2026:28208
access.redhat.com / errata/RHSA-2026:28999
access.redhat.com / errata/RHSA-2026:29212
access.redhat.com / errata/RHSA-2026:29815
access.redhat.com / errata/RHSA-2026:29904
access.redhat.com / errata/RHSA-2026:29953
access.redhat.com / errata/RHSA-2026:32983
access.redhat.com / errata/RHSA-2026:32994
access.redhat.com / errata/RHSA-2026:33441
access.redhat.com / errata/RHSA-2026:33497
access.redhat.com / errata/RHSA-2026:34043
access.redhat.com / errata/RHSA-2026:34362
access.redhat.com / errata/RHSA-2026:34363
access.redhat.com / errata/RHSA-2026:35880
access.redhat.com / errata/RHSA-2026:42555
access.redhat.com / errata/RHSA-2026:44420
access.redhat.com / errata/RHSA-2026:44481
access.redhat.com / security/cve/CVE-2026-6478
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-6478.json
postgresql.org / support/security/CVE-2026-6478
PatchVendor Advisory