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CVE-2026-6478

PostgreSQL discloses MD5-hashed passwords via covert timing channel

Published: May 14, 2026Updated: May 18, 2026 Sources: CVE List NVD BDUCWE-385
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.2%
Top 85.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-385

Affected Products

PostgreSQLn/a
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
SUSE Linux Enterprise Server for SAP ApplicationsNovell Inc.
On-premOS
Operating Systems / linux-distro
АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
Suse Linux Enterprise ServerNovell Inc.
On-premOS
Operating Systems / linux-distro
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
novell inc.commercialUSOperating Systems
ао «ивк»commercialRUOperating Systemsaka ivk
and 7 more affected products View all →

Exploitability

Official Patch Available
Workaround Available

References

https://www.postgresql.org/support/security/CVE-2026-6478/
postgresql.org
https://www.postgresql.org/support/security/CVE-2026-6478/
postgresql.org
https://www.postgresql.org/about/news/postgresql-184-1710-1614-1518-and-1423-released-3297/
postgresql.org
and 8 more references View all →

Timeline

Published
May 14, 2026
Last Updated
May 18, 2026

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