{"id":"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.","aliases":["CVE-2026-54291","GHSA-j92g-9f8w-j867"],"modified":"2026-09-08T08:48:24.727586531Z","published":"2026-07-12T23:50:28.176Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:postgresql:postgresql_jdbc_driver:*:*:*:*:*:*:*:*","cpe:2.3:a:postgresql:postgresql_jdbc_driver:*:*:*:*:*:maven:*:*"]},"references":[{"type":"WEB","url":"https://github.com/ongres/scram/releases/tag/3.3"},{"type":"FIX","url":"https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99"},{"type":"ADVISORY","url":"https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54291"}],"affected":[{"package":{"name":"postgresql-jdbc-driver","ecosystem":"Bitnami","purl":"pkg:bitnami/postgresql-jdbc-driver"},"ranges":[{"type":"SEMVER","events":[{"introduced":"42.7.4"},{"fixed":"42.7.12"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/postgresql-jdbc-driver/BIT-postgresql-jdbc-driver-2026-54291.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.9.0"}