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PostgreSQL EUVDEUVD-2026-57838

| CVE-2026-14672 MEDIUM
Observable Response Discrepancy (CWE-204)
2026-08-13 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 GHSA-hp2m-55fj-8mw5
Information Disclosure PostgreSQL
5.3
CVSS 3.1 · Vendor: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
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Severity by source

Vendor (f86ef6dc-4d3a-42ad-8f28-e6d5547a5007) PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
5.3 MEDIUM

Network-reachable unauthenticated pre-auth handshake; low confidentiality impact limited to username existence; no integrity or availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Primary rating from Vendor (f86ef6dc-4d3a-42ad-8f28-e6d5547a5007).

CVSS VectorVendor: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Patch available
Aug 13, 2026 - 14:02 EUVD
Analysis Generated
Aug 13, 2026 - 13:45 vuln.today
CVE Published
Aug 13, 2026 - 13:17 cve.org
MEDIUM 5.3

DescriptionCVE.org

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 18.5, 17.11, and 16.15 are affected. Versions before PostgreSQL 16 are unaffected.

AnalysisAI

User enumeration via SCRAM authentication in PostgreSQL 16-18 exposes whether a given username exists by observing differences in the reported SCRAM iteration count during the authentication handshake. An unauthenticated remote attacker can distinguish real accounts from nonexistent ones when the target account uses a non-default scram_iterations value, since the server returns a custom count for real users but the global default for fabricated usernames. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Connect to PostgreSQL port 5432
Delivery
Initiate SCRAM-SHA-256 handshake for target username
Exploit
Observe iteration count in server first-message
Execution
Compare count against known default
Impact
Identify existing accounts by non-default count
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target PostgreSQL account has been configured with a non-default scram_iterations value - accounts using the server-wide default iteration count cannot be distinguished from nonexistent users and are not vulnerable. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N reflects network-accessible, unauthenticated exploitation with low confidentiality impact, yielding a moderate score of 5.3 - accurately calibrated for an information-disclosure-only finding. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network access to the PostgreSQL listener sends SCRAM authentication initiation messages for a list of candidate usernames without completing the handshake. By recording the scram_iterations value returned in each server first-message, the attacker identifies accounts with non-default iteration counts as confirmed existing users, building a valid username list for subsequent credential-stuffing or targeted attacks. …
Remediation Upgrade to the patched minor releases: PostgreSQL 18.5, 17.11, or 16.15, as confirmed by the vendor advisory at https://www.postgresql.org/support/security/CVE-2026-14672/. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected

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EUVD-2026-57838 vulnerability details – vuln.today
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