A client-side Denial of Service vulnerability (CVE-2026-42198, CVSS 7.5 HIGH) exists in the PostgreSQL JDBC driver (pgjdbc) where a malicious SCRAM-SHA-256 authentication response can crash the client application. The vulnerability affects versions from 42.2.0 through 42.7.10, and it is fixed in version 42.7.11. Red Hat has issued an Important security update for the postgresql-jdbc package on specific RHEL 8.4 support channels to address this issue.
Red Hat Product Errata RHSA-2026:59278 - Security Advisory Issued: 2026-08-25 Updated: 2026-08-25 RHSA-2026:59278 - 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 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. 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 Life Cycle Long Life 8.4 x86_64 Red Hat Enterprise Linux Server - AUS 8.4 x86_64 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 Life Cycle Long Life 8.4 SRPM postgresql-jdbc-42.2.3-7.el8_4.1.src.rpm SHA-256: 0aeab74d6f240f934ea5cb8a91fc45bb7b3e0537de77f54840edea310d058e7e x86_64 postgresql-jdbc-42.2.3-7.el8_4.1.noarch.rpm SHA-256: 52f6817dc82081802986eff9cae82d1ff4dcbe50c5f829744303908bf96af953 postgresql-jdbc-javadoc-42.2.3-7.el8_4.1.noarch.rpm SHA-256: ce64b7940115c37f26a9980416087965102a57c17c8a9a9940df163fd7078aa5 Red Hat Enterprise Linux Server - AUS 8.4 SRPM postgresql-jdbc-42.2.3-7.el8_4.1.src.rpm SHA-256: 0aeab74d6f240f934ea5cb8a91fc45bb7b3e0537de77f54840edea310d058e7e x86_64 postgresql-jdbc-42.2.3-7.el8_4.1.noarch.rpm SHA-256: 52f6817dc82081802986eff9cae82d1ff4dcbe50c5f829744303908bf96af953 postgresql-jdbc-javadoc-42.2.3-7.el8_4.1.noarch.rpm SHA-256: ce64b7940115c37f26a9980416087965102a57c17c8a9a9940df163fd7078aa5 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .