{"id":"CVE-2026-54291","title":"org.postgresql/postgresql: com.ongres.scram/scram-client: pgjdbc: Man-in-the-middle protection bypass via SCRAM-SHA-256-PLUS downgrade (CVE…","summary":"A flaw was found in pgjdbc, an open-source PostgreSQL JDBC Driver. A remote attacker who can intercept a TLS (Transport Layer Security) connection can silently downgrade connections configured to require channel binding from SCRAM-SHA-256-…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","cvssSource":"vendor","cwe":["CWE-940","CWE-636","CWE-757"],"vendor":"Red Hat","product":"Cryostat 4","affected":["cryostat 4","amq_broker 7","build_of_apicurio_registry 3","build_of_debezium 3","build_of_keycloak","data_grid 8","single_sign_on 7","build_of_quarkus 3.27.5","build_of_quarkus 3.33.3"],"patched":["build_of_quarkus 3.27.5","build_of_quarkus 3.33.3"],"published":"2026-07-06","updated":"2026-10-20","sourceUpdated":"2026-10-20T04:42:37+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54291.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54291.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-54291"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2497465"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-54291"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54291"},{"url":"https://github.com/ongres/scram/releases/tag/3.3"},{"url":"https://github.com/pgjdbc/pgjdbc/commit/77df98e4e66c12936ded3478a0954f6f580bad99"},{"url":"https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-j92g-9f8w-j867"},{"url":"https://access.redhat.com/errata/RHSA-2026:53643"},{"url":"https://access.redhat.com/errata/RHSA-2026:51653"},{"url":"https://github.com/advisories/GHSA-j92g-9f8w-j867"}],"tags":["csaf","vex","red-hat","ghsa","maven"],"epss":0.00236,"epssPercentile":0.14555,"aliases":["GHSA-j92g-9f8w-j867"],"ecosystem":"maven","ingestedAt":"2026-07-21T17:52:45.737Z","slug":"CVE-2026-54291","body":"## Overview\n\nA flaw was found in pgjdbc, an open-source PostgreSQL JDBC Driver. A remote attacker who can intercept a TLS (Transport Layer Security) connection can silently downgrade connections configured to require channel binding from SCRAM-SHA-256-PLUS to plain SCRAM-SHA-256. This downgrade bypasses the intended man-in-the-middle protection, allowing the attacker to potentially intercept or alter sensitive communication. The vulnerability occurs because the system fails to properly validate the channel binding when a specific type of certificate is used.\n\n## Vendor advisories\n\n- **RHSA-2026:53643** · Red Hat · fixed in: Red Hat build of Quarkus 3.27.5 · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:53643)\n- **RHSA-2026:51653** · Red Hat · fixed in: Red Hat build of Quarkus 3.33.3 · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:51653)\n- **Red Hat VEX** · Moderate · affected: Cryostat 4, Red Hat AMQ Broker 7, Red Hat build of Apicurio Registry 3, Red Hat build of Debezium 3, Red Hat Build of Keycloak, Red Hat Data Grid 8, … · no fix planned: Cryostat 4, Red Hat AMQ Broker 7, Red Hat build of Apicurio Registry 3, Red Hat build of Debezium 3, … · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54291.json)\n\n**org.postgresql/postgresql: com.ongres.scram/scram-client: pgjdbc: Man-in-the-middle protection bypass via SCRAM-SHA-256-PLUS downgrade** — rated Moderate by Red Hat. Released 2026-07-06, updated 2026-10-20.\n\nAffected:\n\n- Cryostat 4\n- Red Hat AMQ Broker 7\n- Red Hat build of Apicurio Registry 3\n- Red Hat build of Debezium 3\n- Red Hat Build of Keycloak\n- Red Hat Data Grid 8\n- Red Hat Single Sign-On 7\n\nFixed:\n\n- Red Hat build of Quarkus 3.27.5\n- Red Hat build of Quarkus 3.33.3\n\nNo fix planned:\n\n- Cryostat 4\n- Red Hat AMQ Broker 7\n- Red Hat build of Apicurio Registry 3\n- Red Hat build of Debezium 3\n- Red Hat Data Grid 8\n- Red Hat Single Sign-On 7\n- Red Hat Build of Keycloak\n\nNot affected:\n\n- Red Hat Hardened Images\n\n## Remediation\n\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor information about how to apply this update, see https://access.redhat.com/articles/11258. https://access.redhat.com/errata/RHSA-2026:53643\nBefore applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:51653\n\n## Package advisory (CVE-2026-54291)\n\nAffected packages:\n\n- `org.postgresql:postgresql >= 42.7.4, < 42.7.12`\n\nPatched in:\n\n- `org.postgresql:postgresql 42.7.12`\n\nSource: https://github.com/advisories/GHSA-j92g-9f8w-j867","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":214820,"id":"CVE-2026-54291","ts":1790927910175,"field":"cvss","old":null,"new":"5.9"},{"seq":214819,"id":"CVE-2026-54291","ts":1790927910175,"field":"severity","old":"high","new":"medium"}]}