CVE-2026-6478
PostgreSQL discloses MD5-hashed passwords via covert timing channel
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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:LConfidentialityLow
I:LIntegrityLow
A:NAvailabilityNone
Weaknesses
Affected Products
Novell Inc.
commercial·US
postgresql
oss-project·USaka postgres
Сообщество свободного программного обеспечения
oss-projectaka fsf
АО «ИВК»
commercial·RUaka ivk
Postgres Professional
commercialaka postgres pro enterprise, postgres pro certified
PostgreSQL Global Development Group
oss-project·USaka postgresql
and 4 more affected products View all →
Exploitability
Official Patch Available
Workaround Available
References
https://www.postgresql.org/support/security/CVE-2026-6478/
postgresql.org
https://access.redhat.com/errata/RHSA-2026:21182
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:22878
access.redhat.com
and 45 more references View all →
Unlock Complete Vulnerability Intelligence
Get the full picture for CVE-2026-6478 and every CVE in our database. Create a free account — no credit card required.
Create Free AccountPlain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows