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Vulnerability · Published Aug 13, 2026 · Assigned by PostgreSQL

CVE-2026-14672PostgreSQL observable response discrepancy with non-default scram_iterations provides user existence oracle

Medium 5.3

In plain English

A medium-severity security flaw in PostgreSQL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 66.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Observable response discrepancy in PostgreSQL SCRAM authentication allows an unauthenticated user to test the existence of a user via observing the SCRAM iteration count. This requires the probed user to have a non-default scram_iterations count, because the authentication challenge for a nonexistent user reports the default scram_iterations. Within major versions 16-18, minor versions before PostgreSQL 18.6, 17.11, and 16.15 are affected. Versions before PostgreSQL 16 are unaffected.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.21postgresql1515.19-r0ALPINE-CVE-2026-14672
Alpine:v3.22postgresql1515.19-r0ALPINE-CVE-2026-14672
Alpine:v3.21postgresql1616.15-r0ALPINE-CVE-2026-14672
Alpine:v3.22postgresql1616.15-r0ALPINE-CVE-2026-14672
Alpine:v3.23postgresql1616.15-r0ALPINE-CVE-2026-14672
Alpine:v3.24postgresql1616.15-r0ALPINE-CVE-2026-14672
Alpine:v3.21postgresql1717.11-r0ALPINE-CVE-2026-14672
Alpine:v3.22postgresql1717.11-r0ALPINE-CVE-2026-14672
Alpine:v3.23postgresql1717.11-r0ALPINE-CVE-2026-14672
Alpine:v3.24postgresql1717.11-r0ALPINE-CVE-2026-14672
Alpine:v3.23postgresql1818.5-r0ALPINE-CVE-2026-14672
Alpine:v3.24postgresql1818.5-r0ALPINE-CVE-2026-14672
Debian:13postgresql-1717.11-0+deb13u1DEBIAN-CVE-2026-14672
Debian:14postgresql-1818.6-1DEBIAN-CVE-2026-14672
Ubuntu:22.04:LTSpostgresql-1414.24-0ubuntu0.22.04.1USN-8653-1
Ubuntu:24.04:LTSpostgresql-1616.15-0ubuntu0.24.04.1USN-8653-1
Ubuntu:24.04:LTSpostgresql-1616.15-0ubuntu0.24.04.1UBUNTU-CVE-2026-14672
Ubuntu:26.04:LTSpostgresql-1818.6-0ubuntu0.26.04.1USN-8653-1
Ubuntu:26.04:LTSpostgresql-1818.6-0ubuntu0.26.04.1UBUNTU-CVE-2026-14672

Affected products (as reported)

VendorProductVersions
n/a PostgreSQL 18 – before 18.617 – before 17.1116 – before 16.15

Weakness: CWE-204 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References