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PostgreSQL CVE-2026-6479

| EUVDEUVD-2026-30288 HIGH
Uncontrolled Recursion (CWE-674)
2026-05-14 PostgreSQL GHSA-hwfh-mh4f-m67f
Denial Of Service PostgreSQL Suse
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

3
Patch available
May 14, 2026 - 15:01 EUVD
Analysis Generated
May 14, 2026 - 14:01 vuln.today
CVE Published
May 14, 2026 - 13:00 nvd
HIGH 7.5

DescriptionCVE.org

Uncontrolled recursion in PostgreSQL SSL and GSS negotiation allows an attacker able to connect to a PostgreSQL AF_UNIX socket to achieve sustained denial of service. If SSL and GSS are both disabled, an attacker can do the same via access to a PostgreSQL TCP socket. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

AnalysisAI

Denial of service in PostgreSQL allows remote unauthenticated attackers to crash the database server via recursive SSL/GSS negotiation when connecting to AF_UNIX or TCP sockets (if SSL and GSS are both disabled). Affects all PostgreSQL versions prior to 18.4, 17.10, 16.14, 15.18, and 14.23. No active exploitation confirmed (not in CISA KEV). Vendor-released patches available across all supported major versions. EPSS data not available, but CVSS 7.5 (AV:N/AC:L/PR:N/UI:N) indicates high availability impact with low barrier to exploitation.

Technical ContextAI

PostgreSQL's SSL and GSS (Generic Security Services) negotiation protocols contain an uncontrolled recursion vulnerability (CWE-674). During connection establishment, the server's SSL/GSS handshake logic can be manipulated to trigger recursive function calls that exhaust stack memory, causing the database process to crash. The vulnerability exists in the connection negotiation phase before authentication, affecting the postmaster or backend processes that handle new connections. The CPE string indicates this affects PostgreSQL database server installations across platforms. When SSL and GSS are both disabled, the attack surface expands from AF_UNIX (local domain) sockets to include TCP network sockets, significantly widening the potential attacker base from local users to remote network adversaries.

RemediationAI

Upgrade immediately to PostgreSQL 18.4, 17.10, 16.14, 15.18, or 14.23 depending on your current major version branch. Download patched versions from the official PostgreSQL release pages or use your distribution's package manager after security updates are published. Official vendor advisory with upgrade instructions: https://www.postgresql.org/support/security/CVE-2026-6479/. Until patching is complete, implement network-layer compensating controls: restrict PostgreSQL TCP socket access (default port 5432) using firewall rules to allow only trusted IP addresses; if the database serves only local applications, bind PostgreSQL to localhost-only (listen_addresses='localhost' in postgresql.conf) to eliminate remote attack surface; enable SSL/GSS authentication if not already configured, as this reduces exposure to AF_UNIX socket attacks only (though does not eliminate the vulnerability). Trade-offs: network restrictions may break legitimate remote access; localhost-only binding prevents distributed application architectures; enabling SSL/GSS requires certificate/credential management overhead. These mitigations reduce but do not eliminate risk-patching remains the definitive fix. Restart PostgreSQL service after applying any configuration changes.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed

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CVE-2026-6479 vulnerability details – vuln.today
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