CVE-2026-6479

PostgreSQL SSL/GSS init causes denial of service, via uncontrolled recursion

Published May 14, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Workaround

enable SSL and/or GSS; disable unix_socket_directories

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4646-1 postgresql-13 security update
Debian DSA Debian DSA DSA-6269-1 postgresql-15 security update
Debian DSA Debian DSA DSA-6270-1 postgresql-17 security update
Ubuntu USN Ubuntu USN USN-8294-1 PostgreSQL vulnerabilities
History
Type Values Removed Values Added
CPEs cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Postgresql
Postgresql postgresql
Vendors & Products Postgresql
Postgresql postgresql
Type Values Removed Values Added
Description 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.
Title PostgreSQL SSL/GSS init causes denial of service, via uncontrolled recursion
Weaknesses CWE-674
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
PostgreSQL
Published
Updated
May 14, 2026, 3:26 PM
Reserved
Apr 17, 2026, 12:45 AM
Status
Analyzed
Published
May 14, 2026, 2:16 PM
Modified
Nov 11, 2026, 8:10 PM