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CVE-2026-6479

30
FAUCET Score

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.

First published: May 14, 2026Last modified: May 14, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 14.23CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
>= 15.0, < 15.18CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
>= 16.0, < 16.14CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
>= 17.0, < 17.10CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*
>= 18.0, < 18.4CPE matchmatch criteria
cpe:2.3:a:postgresql:postgresql:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.47%
Probability of exploitation in next 30 days
EPSS Percentile
38.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0047 is in the 17th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: 21340-17084Fixed in: 16.14-1
microsoftpatch availablevia msrc
Product: azl3 postgresql 16.12-1 on Azure Linux 3.0Fixed in: 16.14-1
ubuntupatch availablevia ubuntu_usn
Product: postgresql-14 (jammy)Fixed in: 14.23-0ubuntu0.22.04.1
ubuntupatch availablevia ubuntu_usn
Product: postgresql-16 (noble)Fixed in: 16.14-0ubuntu0.24.04.1
ubuntupatch availablevia ubuntu_usn
Product: postgresql-17 (questing)Fixed in: 17.10-0ubuntu0.25.10.1
ubuntupatch availablevia ubuntu_usn
Product: postgresql-18 (resolute)Fixed in: 18.4-0ubuntu0.26.04.1

Vendor Advisories (2)

ubuntuUSN-8294-1

PostgreSQL vulnerabilities

May 21, 2026
microsoft2026-May/CVE-2026-6479Important

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

May 12, 2026

References

postgresql.org / support/security/CVE-2026-6479
PatchVendor Advisory