Red Hat Product Errata RHSA-2026:55930 - Security Advisory Issued: 2026-08-18 Updated: 2026-08-18 RHSA-2026:55930 - Security Advisory Overview Updated Packages Synopsis Important: mod_http2 security update Type/Severity Security Advisory: Important Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for mod_http2 is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions. 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 The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers. Security Fix(es): mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020) httpd: httpd: HTTP/2 Remote Denial of Service via compression bomb and Slowloris-style attack (CVE-2026-49975) httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951) 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 For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Affected Products Red Hat Enterprise Linux Server - AUS 9.2 x86_64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.2 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.2 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.2 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.2 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.2 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.2 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.2 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.2 s390x Fixes BZ - 2379343 - CVE-2025-53020 mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase BZ - 2485371 - CVE-2026-49975 httpd: httpd: HTTP/2 Remote Denial of Service via compression bomb and Slowloris-style attack BZ - 2486415 - CVE-2026-43951 httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime CVEs CVE-2025-53020 CVE-2026-43951 CVE-2026-49975 References https://access.redhat.com/security/updates/classification/#important Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux Server - AUS 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 x86_64 mod_http2-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: 8809ca23bc7ad22b610e5c102b20798be638b3e007442e7e795e03e30e0ae160 mod_http2-debuginfo-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: 54aedd7d293aaae779c30efb24f29385885078b1ad1b46f3691a6ce7eb559540 mod_http2-debugsource-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: e29a5906304169455bbaab7d70841eeb583adafbc874c1f55d6b8d5cf6acd129 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 ppc64le mod_http2-1.15.19-4.el9_2.8.ppc64le.rpm SHA-256: 996f183bb290415a33574fffefee193069f26378694cb1c1d9d28ce71e873a96 mod_http2-debuginfo-1.15.19-4.el9_2.8.ppc64le.rpm SHA-256: c428e7bb27a0a4e87dd95910aca9d4a085213cbf9c1067f162c926f98ccb00fd mod_http2-debugsource-1.15.19-4.el9_2.8.ppc64le.rpm SHA-256: 2a3370487f6c40c8e716797e4bf05e74fa30ccfbe1cee16dfe74d76d77d5af97 Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 x86_64 mod_http2-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: 8809ca23bc7ad22b610e5c102b20798be638b3e007442e7e795e03e30e0ae160 mod_http2-debuginfo-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: 54aedd7d293aaae779c30efb24f29385885078b1ad1b46f3691a6ce7eb559540 mod_http2-debugsource-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: e29a5906304169455bbaab7d70841eeb583adafbc874c1f55d6b8d5cf6acd129 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 aarch64 mod_http2-1.15.19-4.el9_2.8.aarch64.rpm SHA-256: b7a60698bc56e5a350b56875b76e591457d4ec74cc363233e8ca2de335839898 mod_http2-debuginfo-1.15.19-4.el9_2.8.aarch64.rpm SHA-256: 31eda13a997ad0cdcd2570b87c270835d236df8f07309d5dbe67d8c48eef781d mod_http2-debugsource-1.15.19-4.el9_2.8.aarch64.rpm SHA-256: af4206f23a934931bfd9503f1b46f6f8070137eb754f4f7d988b004548b8b797 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 s390x mod_http2-1.15.19-4.el9_2.8.s390x.rpm SHA-256: db2efc4f6acbfe234a5859188aec93c9a1bedf9911fa86e6c5880e31aa6a6e5c mod_http2-debuginfo-1.15.19-4.el9_2.8.s390x.rpm SHA-256: 8f9148749feab3879d916df984d98233fef19e201406acaa57d804e7bd2456da mod_http2-debugsource-1.15.19-4.el9_2.8.s390x.rpm SHA-256: 836f975a6688fec7f3e18087104cea601790b426054341779c6b37d8bf4c6bc7 Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 x86_64 mod_http2-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: 8809ca23bc7ad22b610e5c102b20798be638b3e007442e7e795e03e30e0ae160 mod_http2-debuginfo-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: 54aedd7d293aaae779c30efb24f29385885078b1ad1b46f3691a6ce7eb559540 mod_http2-debugsource-1.15.19-4.el9_2.8.x86_64.rpm SHA-256: e29a5906304169455bbaab7d70841eeb583adafbc874c1f55d6b8d5cf6acd129 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 aarch64 mod_http2-1.15.19-4.el9_2.8.aarch64.rpm SHA-256: b7a60698bc56e5a350b56875b76e591457d4ec74cc363233e8ca2de335839898 mod_http2-debuginfo-1.15.19-4.el9_2.8.aarch64.rpm SHA-256: 31eda13a997ad0cdcd2570b87c270835d236df8f07309d5dbe67d8c48eef781d mod_http2-debugsource-1.15.19-4.el9_2.8.aarch64.rpm SHA-256: af4206f23a934931bfd9503f1b46f6f8070137eb754f4f7d988b004548b8b797 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 ppc64le mod_http2-1.15.19-4.el9_2.8.ppc64le.rpm SHA-256: 996f183bb290415a33574fffefee193069f26378694cb1c1d9d28ce71e873a96 mod_http2-debuginfo-1.15.19-4.el9_2.8.ppc64le.rpm SHA-256: c428e7bb27a0a4e87dd95910aca9d4a085213cbf9c1067f162c926f98ccb00fd mod_http2-debugsource-1.15.19-4.el9_2.8.ppc64le.rpm SHA-256: 2a3370487f6c40c8e716797e4bf05e74fa30ccfbe1cee16dfe74d76d77d5af97 Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.2 SRPM mod_http2-1.15.19-4.el9_2.8.src.rpm SHA-256: a24b907eb1bd41a5ac483259315e7c4baaced6d4177e9bfe718ba0a88efa11d9 s390x mod_http2-1.15.19-4.el9_2.8.s390x.rpm SHA-256: db2efc4f6acbfe234a5859188aec93c9a1bedf9911fa86e6c5880e31aa6a6e5c mod_http2-debuginfo-1.15.19-4.el9_2.8.s390x.rpm SHA-256: 8f9148749feab3879d916df984d98233fef19e201406acaa57d804e7bd2456da mod_http2-debugsource-1.15.19-4.el9_2.8.s390x.rpm SHA-256: 836f975a6688fec7f3e18087104cea601790b426054341779c6b37d8bf4c6bc7 The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .