Red Hat alert RHSA-2026:0928-01 (java-21-openjdk)

An update for java-21-openjdk is now available for Red Hat Enterprise Linux
8, Red Hat Enterprise Linux 9.4 Extended Update Support, Red Hat Enterprise
Linux 9.6 Extended Update Support, Red Hat Enterprise Linux 9, and Red Hat
Enterprise Linux 10.

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.

The OpenJDK 21 packages provide the OpenJDK 21 Java Runtime Environment and
the OpenJDK 21 Java Software Development Kit.

Security Fix(es):

* JDK: Improve JMX connections (CVE-2026-21925)

* JDK: Improve HttpServer Request handling (CVE-2026-21933)

* JDK: Enhance Certificate Checking (CVE-2026-21945)

* libpng: LIBPNG buffer overflow (CVE-2025-64720)

* libpng: LIBPNG heap buffer overflow (CVE-2025-65018)

Bug Fix(es):

* When using a P11SecretKey for both signing and encryption in FIPS mode, the
FIPS PKCS11 provider would fail with a CKR_ATTRIBUTE_VALUE_INVALID error.
This was due to the default configuration not applying the CKA_ENCRYPT=true
attribute to the key.  The configuration in this release is updated to
include this attribute. (RHEL-142860, RHEL-142876, RHEL-142877, RHEL-142878,
RHEL-142879, RHEL-142880)

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.

This content is licensed under the Creative Commons Attribution 4.0
International License (https://creativecommons.org/licenses/by/4.0/). If you
distribute this content, or a modified version of it, you must provide
attribution to Red Hat Inc. and provide a link to the original.

Original: https://access.redhat.com/security/data/csaf/v2/advisories/2026/rhsa-2026_0928.json