---
id: CVE-2026-14672
title: >-
  Observable response discrepancy in PostgreSQL SCRAM authentication allows an
  unauthenticated user to test the existence of a user via observing the SCRAM
  iteration count
summary: >-
  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_iterati…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-204
vendor: postgresql
product: postgresql
affected:
  - 'postgresql >= 14.0, < 14.24'
  - 'postgresql >= 15.0, < 15.19'
  - 'postgresql >= 16.0, < 16.15'
  - 'postgresql >= 17.0, < 17.11'
  - 'postgresql >= 18.0, < 18.5'
patched:
  - postgresql 18.5
published: '2026-08-13'
updated: '2026-08-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-14672'
references:
  - url: 'https://www.postgresql.org/support/security/CVE-2026-14672/'
    label: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
tags:
  - nvd
epss: 0.00252
epssPercentile: 0.14867
ingestedAt: '2026-08-29T23:43:53.250Z'
---

## Overview

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

- `postgresql >= 14.0, < 14.24`
- `postgresql >= 15.0, < 15.19`
- `postgresql >= 16.0, < 16.15`
- `postgresql >= 17.0, < 17.11`
- `postgresql >= 18.0, < 18.5`

## Remediation

Upgrade past the affected range:

- `postgresql 18.5`