CVE-2026-54291

pgjdbc is an open source postgresql JDBC Driver. In releases 42.7.4 through 42.7.11, channelBinding=require connections can be silently downgraded from SCRAM-SHA-256-PLUS with channel binding to plain SCRAM-SHA-256 without it, losing the man-in-the-middle protection the setting is meant to guarantee. An attacker who can intercept the TLS connection can trigger the downgrade with a certificate whose signature algorithm has no tls-server-end-point channel-binding hash, because the bundled com.ongres.scram:scram-client returns an empty byte array instead of failing and pgJDBC ScramAuthenticator checks only that the server advertised a PLUS mechanism, without rejecting the empty binding or checking that the negotiated mechanism uses channel binding. This issue is fixed in version 42.7.12.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/ongres/scram/releases/tag/3.3	Not Applicable
https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99	Patch
https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:postgresql:postgresql_jdbc_driver:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-06 19:17

Updated : 2026-07-09 13:16

NVD link : CVE-2026-54291

Mitre link : CVE-2026-54291

CVE.ORG link : CVE-2026-54291

JSON object : View

Products Affected

postgresql

postgresql_jdbc_driver

CWE

CWE-636

Not Failing Securely ('Failing Open')

CWE-757

Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

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