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

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Summary

CVECVE-2026-6479
StatePUBLISHED
AssignerPostgreSQL
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-14 14:16:25 UTC
Updated2026-05-18 15:04:25 UTC
DescriptionUncontrolled 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

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

EPSS: 0.000180000 probability, percentile 0.048680000 (date 2026-05-25)

Problem Types: CWE-674 | CWE-674 Uncontrolled Recursion

VersionSourceTypeScoreSeverityVector
3.1f86ef6dc-4d3a-42ad-8f28-e6d5547a5007Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Postgresql Postgresql All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na PostgreSQL affected 18 18.4 rpm Not specified
CNA Na PostgreSQL affected 17 17.10 rpm Not specified
CNA Na PostgreSQL affected 16 16.14 rpm Not specified
CNA Na PostgreSQL affected 15 15.18 rpm Not specified
CNA Na PostgreSQL affected 14.23 rpm Not specified

References

ReferenceSourceLinkTags
www.postgresql.org/support/security/CVE-2026-6479 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 www.postgresql.org Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: The PostgreSQL project thanks Calif.io in collaboration with Claude and Anthropic Research for reporting this problem. (en)

Additional Advisory Data

Workarounds

CNA: enable SSL and/or GSS; disable unix_socket_directories

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