RHSA-2026:27200 - Security Advisory

Topic

Red Hat JBoss Core Services Apache HTTP Server 2.4.62 Service Pack 4 is now available.

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 Core Services is a set of supplementary software for Red Hat JBoss middleware products. This software, such as Apache HTTP Server, is common to multiple JBoss middleware products and packaged under Red Hat JBoss Core Services, to allow for faster distribution of updates and for a more consistent update experience.

This release of Red Hat JBoss Core Services Apache HTTP Server 2.4.62 Service Pack 4 serves as a replacement for Red Hat JBoss Core Services Apache HTTP Server 2.4.62 Service Pack 3, and includes bug fixes and enhancements, which are documented in the Release Notes linked to in the References section.

Security Fix(es):

• jbcs-httpd24-httpd: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)
• jbcs-httpd24-httpd: HTTP/2: Remote Denial of Service via compression bomb and Slowloris-style attack (CVE-2026-49975)
• jbcs-httpd24-mod_http2: HTTP/2: Remote Denial of Service via compression bomb and Slowloris-style attack (CVE-2026-49975)
• mod_proxy_ajp.so: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)
• mod_proxy_ajp.so: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)
• mod_authn_socache.so: NULL pointer dereference can cause a child process crash (CVE-2026-33007)
• mod_proxy_ajp.so: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)
• mod_dav_lock.so: NULL pointer dereference via specially crafted request (CVE-2026-29169)
• jbcs-httpd24-mod_md: unrestricted OCSP response leads to resource exhaustion (CVE-2026-29168)
• jbcs-httpd24-httpd: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020)
• nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination (CVE-2026-27135)

A Red Hat Security Bulletin which addresses further details about this flaw is available in the References section.

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, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat JBoss Core Services 1 for RHEL 8 x86_64
• Red Hat JBoss Core Services 1 for RHEL 7 x86_64

Fixes

• BZ - 2379343 - CVE-2025-53020 mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase
• BZ - 2448754 - CVE-2026-27135 nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination
• BZ - 2464940 - CVE-2026-34059 httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data()
• BZ - 2464952 - CVE-2026-34032 httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check
• BZ - 2464953 - CVE-2026-33857 httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions
• BZ - 2465296 - CVE-2026-29169 httpd: NULL pointer dereference via specially crafted request
• BZ - 2465299 - CVE-2026-33007 httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash
• BZ - 2466753 - CVE-2026-29168 httpd: mod_md: unrestricted OCSP response leads to resource exhaustion
• BZ - 2466913 - CVE-2026-28780 Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow
• BZ - 2485371 - CVE-2026-49975 httpd: HTTP/2: Remote Denial of Service via compression bomb and Slowloris-style attack

CVEs

• CVE-2025-53020
• CVE-2026-27135
• CVE-2026-28780
• CVE-2026-29168
• CVE-2026-29169
• CVE-2026-33007
• CVE-2026-33857
• CVE-2026-34032
• CVE-2026-34059
• CVE-2026-49975

References

• https://access.redhat.com/security/updates/classification/#important
• https://docs.redhat.com/en/documentation/red_hat_jboss_core_services/2.4.62/html/red_hat_jboss_core_services_apache_http_server_2.4.62_service_pack_4_release_notes/index