Red Hat Product Errata RHSA-2026:57844 - Security Advisory Issued: 2026-08-20 Updated: 2026-08-20 RHSA-2026:57844 - Security Advisory Overview Updated Packages Synopsis Moderate: mod_md security update Type/Severity Security Advisory: Moderate Red Hat Lightspeed patch analysis Identify and remediate systems affected by this advisory. View affected systems Topic An update for mod_md is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. 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 This module manages common properties of domains for one or more virtual hosts. Specifically it can use the ACME protocol to automate certificate provisioning. Certificates will be configured for managed domains and their virtual hosts automatically, including at renewal. Security Fix(es): httpd: mod_md: unrestricted OCSP response leads to resource exhaustion (CVE-2026-29168) 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 9.4 x86_64 Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64 Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64 Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 aarch64 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 s390x Fixes BZ - 2466753 - CVE-2026-29168 httpd: mod_md: unrestricted OCSP response leads to resource exhaustion CVEs CVE-2026-29168 References https://access.redhat.com/security/updates/classification/#moderate Note: More recent versions of these packages may be available. Click a package name for more details. Red Hat Enterprise Linux Server - AUS 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 x86_64 mod_md-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: ba8051dd66b8b57c38e202b339da978b56cd57218a73136eb786a1a39265cb2c mod_md-debuginfo-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: 180bc2a82428dd3494787895a374c103c97d7b79e08a0075ed15de5eb14d1834 mod_md-debugsource-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: 2b0d7e10db48c82ca9e365eb624e7e2a13ed642abef8c8bb2f4e852173ecb51d Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 ppc64le mod_md-2.4.19-1.el9_4.2.ppc64le.rpm SHA-256: 0808a255e9d5bad8d1dad7d8a4b8f0bbf9585493b1b7e70fa7b7cc62bceb7a12 mod_md-debuginfo-2.4.19-1.el9_4.2.ppc64le.rpm SHA-256: b28515f59d21bdad868beeb61ed716698ee2ec2c83b5969a17e402e96b145747 mod_md-debugsource-2.4.19-1.el9_4.2.ppc64le.rpm SHA-256: 23682f98b08b6f1858abd1f4b7d8704648000c7419f10b06c0265f9f56dbb92c Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 x86_64 mod_md-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: ba8051dd66b8b57c38e202b339da978b56cd57218a73136eb786a1a39265cb2c mod_md-debuginfo-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: 180bc2a82428dd3494787895a374c103c97d7b79e08a0075ed15de5eb14d1834 mod_md-debugsource-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: 2b0d7e10db48c82ca9e365eb624e7e2a13ed642abef8c8bb2f4e852173ecb51d Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 aarch64 mod_md-2.4.19-1.el9_4.2.aarch64.rpm SHA-256: 97b9d111b3cbbd27f5fc7c9b560bbead29709e069b191702b10c1a3e98f0b523 mod_md-debuginfo-2.4.19-1.el9_4.2.aarch64.rpm SHA-256: ef3a785dbd57dfe08ce68a7e701abc221378c5b4efcfbfa44b146ca42f710532 mod_md-debugsource-2.4.19-1.el9_4.2.aarch64.rpm SHA-256: 25576df253b79d174fc2068a2f60241269538a101ece5e89ca3b9e13edb457e9 Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 s390x mod_md-2.4.19-1.el9_4.2.s390x.rpm SHA-256: 75697db406157f1e824a6eb15afa951cc91e2dbf7d8af9a9bedc97a71908c14a mod_md-debuginfo-2.4.19-1.el9_4.2.s390x.rpm SHA-256: bbe2cb300d8cd47581f874167475247369ba681565a61bb7223e66bb845ab129 mod_md-debugsource-2.4.19-1.el9_4.2.s390x.rpm SHA-256: 0f0162832fcd369d4e2f891e79003e9032d727c14fa4bd42aa7b94e38f2729eb Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 x86_64 mod_md-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: ba8051dd66b8b57c38e202b339da978b56cd57218a73136eb786a1a39265cb2c mod_md-debuginfo-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: 180bc2a82428dd3494787895a374c103c97d7b79e08a0075ed15de5eb14d1834 mod_md-debugsource-2.4.19-1.el9_4.2.x86_64.rpm SHA-256: 2b0d7e10db48c82ca9e365eb624e7e2a13ed642abef8c8bb2f4e852173ecb51d Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 aarch64 mod_md-2.4.19-1.el9_4.2.aarch64.rpm SHA-256: 97b9d111b3cbbd27f5fc7c9b560bbead29709e069b191702b10c1a3e98f0b523 mod_md-debuginfo-2.4.19-1.el9_4.2.aarch64.rpm SHA-256: ef3a785dbd57dfe08ce68a7e701abc221378c5b4efcfbfa44b146ca42f710532 mod_md-debugsource-2.4.19-1.el9_4.2.aarch64.rpm SHA-256: 25576df253b79d174fc2068a2f60241269538a101ece5e89ca3b9e13edb457e9 Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 ppc64le mod_md-2.4.19-1.el9_4.2.ppc64le.rpm SHA-256: 0808a255e9d5bad8d1dad7d8a4b8f0bbf9585493b1b7e70fa7b7cc62bceb7a12 mod_md-debuginfo-2.4.19-1.el9_4.2.ppc64le.rpm SHA-256: b28515f59d21bdad868beeb61ed716698ee2ec2c83b5969a17e402e96b145747 mod_md-debugsource-2.4.19-1.el9_4.2.ppc64le.rpm SHA-256: 23682f98b08b6f1858abd1f4b7d8704648000c7419f10b06c0265f9f56dbb92c Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 SRPM mod_md-2.4.19-1.el9_4.2.src.rpm SHA-256: fa48af15c525ba1e86d4dc7076ae012d9f8c9cfbcf9ed2428af9c026bfccb830 s390x mod_md-2.4.19-1.el9_4.2.s390x.rpm SHA-256: 75697db406157f1e824a6eb15afa951cc91e2dbf7d8af9a9bedc97a71908c14a mod_md-debuginfo-2.4.19-1.el9_4.2.s390x.rpm SHA-256: bbe2cb300d8cd47581f874167475247369ba681565a61bb7223e66bb845ab129 mod_md-debugsource-2.4.19-1.el9_4.2.s390x.rpm SHA-256: 0f0162832fcd369d4e2f891e79003e9032d727c14fa4bd42aa7b94e38f2729eb The Red Hat security contact is secalert@redhat.com . More contact details at https://access.redhat.com/security/team/contact/ .