A client-side denial-of-service vulnerability (CVE-2026-42198, CVSS 7.5 HIGH) exists in the PostgreSQL JDBC driver where a malicious server can trigger the flaw during SCRAM-SHA-256 authentication. The vulnerability affects versions 42.2.0 through 42.7.10 of the driver. A fix is available in version 42.7.11.
Red Hat Product Errata RHSA-2026:52930 - Security Advisory Issued: 2026-08-10 Updated: 2026-08-10 RHSA-2026:52930 - Security Advisory Overview Updated Packages Synopsis Important: postgresql-jdbc security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for postgresql-jdbc is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Description PostgreSQL is an advanced object-relational database management system. The postgresql-jdbc package includes the .jar files needed for Java programs to access a PostgreSQL database. Security Fix(es): jdbc.postgresql.org: pgjdbc: Client-side Denial of Service via malicious SCRAM-SHA-256 authentication (CVE-2026-42198) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Solution For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.6 x86_64 Red Hat Enterprise Linux Server - AUS 9.6 x86_64 Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.6 s390x Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.6 ppc64le Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.6 aarch64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.6 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.6 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.6 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.6 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.6 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.6 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.6 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.6 s390x Fixes BZ - 2463857 - CVE-2026-42198 jdbc.postgresql.org: pgjdbc: Client-side Denial of Service via malicious SCRAM-SHA-256 authentication CVEs CVE-2026-42198 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux for x86_64 - Extended Update Support 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 x86_64 postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux Server - AUS 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 x86_64 postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 s390x postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for Power, little endian - Extended Update Support 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 ppc64le postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for ARM 64 - Extended Update Support 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 aarch64 postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 ppc64le postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 x86_64 postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 aarch64 postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 s390x postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 x86_64 postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 aarch64 postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 ppc64le postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.6 SRPM postgresql-jdbc-42.2.28-1.el9_6.1.src.rpm SHA-256: f1ca7721305b5e465856c20775efc2ad268a421cb1654c084d2f98e4f154d696 s390x postgresql-jdbc-42.2.28-1.el9_6.1.noarch.rpm SHA-256: 59157987930bce7b9554804a6e22b4af7f1abdc6f2ec4977418d6b786bbc501f The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .