{"id":"CVE-2026-54291","aliases":["BIT-postgresql-jdbc-driver-2026-54291","GHSA-j92g-9f8w-j867"],"url":"https://o3.security/vulnerability/CVE-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.","published":"2026-07-06T18:55:01.675Z","modified":"2026-08-12T16:41:12.300690Z","cvss":null,"epss":{"score":0.00236,"percentile":0.14535,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.postgresql:postgresql","fixedVersion":"42.7.12"}],"fix":{"url":"https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99","label":"pgjdbc/pgjdbc@77df98e"},"references":[{"type":"WEB","url":"https://github.com/ongres/scram/releases/tag/3.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54291.json"},{"type":"ADVISORY","url":"https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54291"},{"type":"FIX","url":"https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T16:41:12.300690Z"}}