Bug 2477445 (CVE-2026-6479)

Summary: CVE-2026-6479 postgresql: PostgreSQL: Denial of Service via uncontrolled recursion in SSL/GSS negotiation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: dschmidt, jlanda, kshier, rhel-process-autobot, simaishi, stcannon, teagle, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in PostgreSQL. Uncontrolled recursion during SSL (Secure Sockets Layer) and GSS (Generic Security Service) negotiation allows an attacker to achieve a sustained denial of service. This can be exploited by an attacker with access to a PostgreSQL AF_UNIX socket. If SSL and GSS are both disabled, the same denial of service can be achieved via a PostgreSQL TCP socket.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2499706, 2499707, 2499708, 2499705    
Bug Blocks:    

Description OSIDB Bzimport 2026-05-14 14:02:03 UTC 
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.
Comment 3 errata-xmlrpc 2026-08-10 02:37:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:52396 https://access.redhat.com/errata/RHSA-2026:52396
Comment 4 errata-xmlrpc 2026-08-10 03:04:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:52395 https://access.redhat.com/errata/RHSA-2026:52395
Comment 5 errata-xmlrpc 2026-08-20 18:08:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:57633 https://access.redhat.com/errata/RHSA-2026:57633