RHSA-2026:73644 - Security Advisory

Topic

An update is now available for Red Hat JBoss Enterprise Application Platform 7.3 for Red Hat Enterprise Linux 7. 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

Red Hat JBoss Enterprise Application Platform 7 is a platform for Java applications based on the WildFly application runtime. This release of Red Hat JBoss Enterprise Application Platform 7.3.19 serves as a replacement for Red Hat JBoss Enterprise Application Platform 7.3.18, and includes bug fixes and enhancements. See the Red Hat JBoss Enterprise Application Platform 7.3.19 Release Notes for information about the most significant bug fixes and enhancements included in this release.

Security Fix(es):

• mchange-commons-java: mchange-commons-java: Arbitrary code execution via JNDI dereferencing of crafted objects [eap-7.3.z] (CVE-2026-27727)
• com.mchange/c3p0: c3p0: Arbitrary Code Execution via deserialization of crafted objects [eap-7.3.z] (CVE-2026-27830)
• netty-codec: Netty: Denial of Service via excessive memory allocation in LZ4FrameDecoder [eap-7.3.z] (CVE-2026-42583)
• netty-handler-proxy: Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation [eap-7.3.z] (CVE-2026-42578)
• netty-codec-http: Netty: HTTP Request Smuggling due to improper handling of conflicting HTTP/1.0 headers [eap-7.3.z] (CVE-2026-42581)
• netty-codec-http: Netty: Request smuggling via malformed Transfer-Encoding parsing [eap-7.3.z] (CVE-2026-42585)
• netty-codec-http: Netty: Incorrect HTTP response parsing leads to data confusion [eap-7.3.z] (CVE-2026-42584)

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

Before applying this update, ensure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

Affected Products

• JBoss Enterprise Application Platform 7.3 EUS 7.3 x86_64

Fixes

• BZ - 2442671 - CVE-2026-27727 com.mchange/mchange-commons-java: mchange-commons-java: Arbitrary code execution via JNDI dereferencing of crafted objects
• BZ - 2442908 - CVE-2026-27830 c3p0: c3p0: Arbitrary Code Execution via deserialization of crafted objects
• BZ - 2477219 - CVE-2026-42583 netty: io.netty/netty-codec-compression: io.netty/netty-codec: Netty: Denial of Service via excessive memory allocation in LZ4FrameDecoder
• BZ - 2477224 - CVE-2026-42584 netty: io.netty/netty-codec-http: Netty: Incorrect HTTP response parsing leads to data confusion
• BZ - 2477226 - CVE-2026-42578 netty: io.netty/netty-handler-proxy: Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation
• BZ - 2477227 - CVE-2026-42585 netty: io.netty/netty-codec-http: Netty: Request smuggling via malformed Transfer-Encoding parsing
• BZ - 2477232 - CVE-2026-42581 netty: io.netty/netty-codec-http: Netty: HTTP Request Smuggling due to improper handling of conflicting HTTP/1.0 headers
• JBEAP-34007 - Tracker for the EAP 7.3.19 release for RHEL-7

CVEs

• CVE-2026-27727
• CVE-2026-27830
• CVE-2026-42578
• CVE-2026-42581
• CVE-2026-42583
• CVE-2026-42584
• CVE-2026-42585

References

• https://access.redhat.com/security/updates/classification/#important
• https://docs.redhat.com/en/documentation/red_hat_jboss_enterprise_application_platform/7.3
• https://docs.redhat.com/en/documentation/red_hat_jboss_enterprise_application_platform/7.3/html-single/installation_guide/index
• https://docs.redhat.com/en/documentation/red_hat_jboss_enterprise_application_platform/7.3/html/7.3.0_release_notes/index