CVE-2026-14672
Description
An observable response discrepancy in PostgreSQL's SCRAM authentication permits user enumeration. Unauthenticated attackers can verify if a specific user exists by observing the authentication iteration count, provided the targeted user is configured with a non-default scram_iterations value.
Statement
A moderate-severity vulnerability in PostgreSQL allows unauthenticated attackers to enumerate valid users. By observing discrepancies in SCRAM authentication responses, attackers can identify users configured with a non-default scram_iterations count, which may facilitate targeted brute-force attacks.
Mitigation
To mitigate this information disclosure, ensure all PostgreSQL users are configured with the default `scram_iterations` count. This prevents the observable response discrepancy that allows an unauthenticated user to determine user existence. Additionally, restrict network access to the PostgreSQL service to only trusted clients and networks by configuring firewall rules to limit inbound connections to the PostgreSQL port (default 5432). If firewall rules are modified, a service reload or restart may be required for changes to take effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | 5.3 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | None | N/A | None |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality,Access Control
Technical Impact: Read Application Data; Bypass Protection Mechanism
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