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PostgreSQL CVE-2026-14681

| EUVDEUVD-2026-57845 MEDIUM
Improper Enforcement of Message Integrity During Transmission (CWE-924)
2026-08-13 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 GHSA-gfpv-wrhp-wwh6
Information Disclosure PostgreSQL Microsoft
4.2
CVSS 3.1 · Vendor: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
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Severity by source

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

Network vector confirmed; AC:H reflects mandatory TLS/GSS config mismatch; PR:L required for valid credentials; C:L/I:L reflect authentication downgrade with no availability impact.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/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

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Patch available
Aug 13, 2026 - 14:02 EUVD
Analysis Generated
Aug 13, 2026 - 13:46 vuln.today
CVE Published
Aug 13, 2026 - 13:17 cve.org
MEDIUM 4.2

DescriptionCVE.org

Improper enforcement of message integrity in PostgreSQL GSSAPI support allows a user to negotiate GSSAPI contrary to pg_hba.conf rules, via initial direct TLS connection. Despite a pg_hba.conf that appears to require GSSAPI, the connection may exchange data over TLS encryption alone. If the TLS settings are more permissive than the GSS settings, the connection may continue with lesser protection. Within major versions 17-18, minor versions before PostgreSQL 18.5 and 17.11 are affected. Versions before PostgreSQL 17 are unaffected.

AnalysisAI

PostgreSQL's GSSAPI authentication enforcement can be bypassed in versions 17.x and 18.x, allowing an authenticated database user to establish a connection protected only by TLS despite pg_hba.conf explicitly requiring GSSAPI. The bypass is achieved by initiating a direct TLS connection rather than a GSSAPI handshake, causing the server to accept the weaker protection profile when TLS settings are more permissive than GSS settings. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires three concurrent conditions: (1) the target PostgreSQL instance is running version 17.x before 17.11 or 18.x before 18.5 - versions prior to 17 are unaffected; (2) pg_hba.conf is configured to require GSSAPI authentication for the relevant host/database combination; and (3) the server's TLS configuration is more permissive than the GSSAPI configuration, creating the mismatch that permits the downgrade. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS 3.1 score of 4.2 (AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N) accurately characterises this as a moderate-severity authentication downgrade, not a critical breach. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to PostgreSQL 18.5 or PostgreSQL 17.11, which are the vendor-released patched versions explicitly named in the advisory. … 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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CVE-2026-14681 vulnerability details – vuln.today
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