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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.

PUBLISHED Reserved 2026-04-17 | Published 2026-05-14 | Updated 2026-05-14 | Assigner PostgreSQL




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Uncontrolled Recursion

Credits

The PostgreSQL project thanks Calif.io in collaboration with Claude and Anthropic Research for reporting this problem.

References

www.postgresql.org/support/security/CVE-2026-6479/

cve.org (CVE-2026-6479)

nvd.nist.gov (CVE-2026-6479)

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