CVE-2026-42198: pgjdbc is an open source postgresql JDBC Driver

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-42198 is a high-severity flaw (CVSS 7.5) affecting postgresql jdbc driver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

pgjdbc is an open source postgresql JDBC Driver. From version 42.2.0 to before version 42.7.11, pgjdbc is vulnerable to a client-side denial of service during SCRAM-SHA-256 authentication. A malicious server can instruct the driver to perform SCRAM authentication with a very large iteration count. With a large enough value, the client spends an unbounded amount of CPU time inside PBKDF2 before authentication can fail. A single attempt ties up a C

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.3% (top 12%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-04-29
Last modified	2026-09-11

Publisher (CNA): GitHub, Inc. · Vendor: postgresql

Last updated 2026-09-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-29 16:16 UTCPublished CVE record published
2026-09-11 13:17 UTCUpdated Record last modified

postgresql postgresql jdbc driver UPGRADE

Affected: >= 42.2.0 and < 42.7.11

Fixed in: 42.7.11

Safe to downgrade to: a release before 42.2.0

1. Check installed version

apt-cache policy postgresql-jdbc-driver || rpm -q postgresql-jdbc-driver || postgresql-jdbc-driver --version

2. UPGRADE to 42.7.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade postgresql-jdbc-driver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade postgresql-jdbc-driver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 42.2.0 (Debian / Ubuntu)

apt-cache madison postgresql-jdbc-driver sudo apt install postgresql-jdbc-driver=<VERSION_BEFORE_42.2.0> sudo apt-mark hold postgresql-jdbc-driver

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list postgresql-jdbc-driver sudo dnf downgrade postgresql-jdbc-driver-<VERSION_BEFORE_42.2.0> sudo dnf versionlock add postgresql-jdbc-driver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:22304] Important: postgresql-jdbc security update 2026-07-02

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42198?

postgresql jdbc driver: upgrade to 42.7.11. Exact commands for each OS are on this page.

Is CVE-2026-42198 being exploited?

CVE-2026-42198 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42198 affect?

CVE-2026-42198 affects postgresql jdbc driver. Severity is high (CVSS 7.5). pgjdbc is an open source postgresql JDBC Driver. From version 42.2.0 to before version 42.7.11, pgjdbc is vulnerable to a client-side denial of service during SCRAM-SHA-256 authentication. A malicious server can instruct the driver to perfo

How urgent is CVE-2026-42198?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

Software pages

PostgreSQL vulnerabilities

Related CVEs

CVE-2026-54291 MEDIUM 5.9 UPGRADE pgjdbc is an open source postgresql JDBC Driver

References

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