Red Hat Product Errata RHSA-2026:27201 - Security Advisory Issued: 2026-06-22 Updated: 2026-06-22 RHSA-2026:27201 - Security Advisory Overview Synopsis Important: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP4 security update Type/Severity Security Advisory: Important 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 Moderate. 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): 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) jbcs-httpd24-openssl: OpenSSL TLS 1.3 server may choose unexpected key agreement group (CVE-2026-2673) libexpat-2.dll: denial of service via crafted XML input (CVE-2026-45186) openssl: openssl: Information Disclosure from Uninitialized Memory via Invalid RSA Public Key (CVE-2026-31790) 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 Text-Only Advisories x86_64 Fixes BZ - 2379343 - CVE-2025-53020 mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase BZ - 2447327 - CVE-2026-2673 openssl: OpenSSL TLS 1.3 server may choose unexpected key agreement group BZ - 2448754 - CVE-2026-27135 nghttp2: nghttp2: Denial of Service via malformed HTTP/2 frames after session termination BZ - 2451094 - CVE-2026-31790 openssl: openssl: Information Disclosure from Uninitialized Memory via Invalid RSA Public Key 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 - 2468575 - CVE-2026-45186 libexpat: denial of service via crafted XML input BZ - 2485371 - CVE-2026-49975 httpd: HTTP/2: Remote Denial of Service via compression bomb and Slowloris-style attack CVEs CVE-2025-53020 CVE-2026-2673 CVE-2026-27135 CVE-2026-28780 CVE-2026-29168 CVE-2026-29169 CVE-2026-31790 CVE-2026-33007 CVE-2026-33857 CVE-2026-34032 CVE-2026-34059 CVE-2026-45186 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 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .