BIT-postgresql-jdbc-driver-2026-54291

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BIT-postgresql-jdbc-driver-2026-54291

Summary: Silent channel-binding authentication downgrade via unsupported certificate algorithms

Details: 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.

References: https://github.com/ongres/scram/releases/tag/3.3, https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99, https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867, https://nvd.nist.gov/vuln/detail/CVE-2026-54291