Uncontrolled Recursion in PostgreSQL - CVE-2026-6479
Published: May 14, 2026
Vulnerability identifier: #VU131461
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-6479
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: PostgreSQL Global Development Group
Affected software:
PostgreSQL
PostgreSQL
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in SSL and GSS negotiation when initializing connections. A remote attacker can connect to a vulnerable socket to cause a denial of service.
If SSL and GSS are both disabled, exploitation is possible via access to a PostgreSQL TCP socket. Otherwise, the attacker must be able to connect to a PostgreSQL AF_UNIX socket.
How to mitigate CVE-2026-6479
Install security update from vendor's website.