{"document":{"aggregate_severity":{"namespace":"https://access.redhat.com/security/updates/classification/","text":"Important"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright © Red Hat, Inc. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"legal_disclaimer","text":"This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.","title":"Terms of Use"}],"publisher":{"category":"vendor","contact_details":"https://access.redhat.com/security/team/contact/","issuing_authority":"Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.","name":"Red Hat Product Security","namespace":"https://www.redhat.com"},"references":[{"category":"self","summary":"Canonical URL","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5172.json"}],"title":"dnsmasq: extract_addresses() OOB read via malformed rdlen","tracking":{"current_release_date":"2026-09-01T11:48:38+00:00","generator":{"date":"2026-09-01T11:48:38+00:00","engine":{"name":"Red Hat 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9","product_id":"red_hat_enterprise_linux_9:dnsmasq.src"},"product_reference":"dnsmasq.src","relates_to_product_reference":"red_hat_enterprise_linux_9"},{"category":"default_component_of","full_product_name":{"name":"openshift/ose-rhel-coreos-8 as a component of Red Hat OpenShift Container Platform 4","product_id":"red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-8"},"product_reference":"openshift/ose-rhel-coreos-8","relates_to_product_reference":"red_hat_openshift_container_platform_4"},{"category":"default_component_of","full_product_name":{"name":"openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4","product_id":"red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-9"},"product_reference":"openshift/ose-rhel-coreos-9","relates_to_product_reference":"red_hat_openshift_container_platform_4"}]},"vulnerabilities":[{"cve":"CVE-2026-5172","cwe":{"id":"CWE-125","name":"Out-of-bounds Read"},"discovery_date":"2026-04-14T22:55:28.042000+00:00","flags":[{"label":"vulnerable_code_not_present","product_ids":["red_hat_enterprise_linux_7:dnsmasq","red_hat_enterprise_linux_7:dnsmasq-utils","red_hat_enterprise_linux_7:dnsmasq.src"]},{"label":"component_not_present","product_ids":["red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-9"]}],"ids":[{"system_name":"Red Hat Bugzilla ID","text":"2458521"}],"notes":[{"category":"description","text":"A heap out-of-bounds read vulnerability was discovered in dnsmasq's DNS response processing. The extract_addresses() function trusts the declared record data length (rdlen) without verifying that a subsequent call to extract_name() stays within the record boundary. A crafted DNS response with a mismatched rdlen causes the remaining-bytes calculation to underflow, resulting in a massive out-of-bounds read and process crash.","title":"Vulnerability description"},{"category":"summary","text":"dnsmasq: extract_addresses() OOB read via malformed rdlen","title":"Vulnerability summary"},{"category":"other","text":"Red Hat rates this as Important. While this bug does not require any special dnsmasq configuration, the impact is limited to denial of service.","title":"Statement"},{"category":"general","text":"The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.","title":"CVSS score applicability"}],"product_status":{"fixed":["AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.aarch64","AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.ppc64le","AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.s390x","AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.src","AppStream-10.2.Z:dnsmasq-0:2.90-7.el10_2.x86_64","AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.aarch64","AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.ppc64le","AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.s390x","AppStream-10.2.Z:dnsmasq-debuginfo-0:2.90-7.el10_2.x86_64","AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.aarch64","AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.ppc64le","AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.s390x","AppStream-10.2.Z:dnsmasq-debugsource-0:2.90-7.el10_2.x86_64","AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.aarch64","AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.ppc64le","AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.s390x","AppStream-10.2.Z:dnsmasq-utils-0:2.90-7.el10_2.x86_64","AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.aarch64","AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.ppc64le","AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.s390x","AppStream-10.2.Z:dnsmasq-utils-debuginfo-0:2.90-7.el10_2.x86_64"],"known_affected":["red_hat_enterprise_linux_6:dnsmasq","red_hat_enterprise_linux_6:dnsmasq-utils","red_hat_enterprise_linux_6:dnsmasq.src","red_hat_enterprise_linux_8:dnsmasq","red_hat_enterprise_linux_8:dnsmasq-utils","red_hat_enterprise_linux_8:dnsmasq.src","red_hat_enterprise_linux_9:dnsmasq","red_hat_enterprise_linux_9:dnsmasq-utils","red_hat_enterprise_linux_9:dnsmasq.src","red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-8"],"known_not_affected":["red_hat_enterprise_linux_7:dnsmasq","red_hat_enterprise_linux_7:dnsmasq-utils","red_hat_enterprise_linux_7:dnsmasq.src","red_hat_openshift_container_platform_4:openshift/ose-rhel-coreos-9"]},"references":[{"category":"self","summary":"Canonical URL","url":"https://access.redhat.com/security/cve/CVE-2026-5172"},{"category":"external","summary":"RHBZ#2458521","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458521"},{"category":"external","summary":"https://www.cve.org/CVERecord?id=CVE-2026-5172","url":"https://www.cve.org/CVERecord?id=CVE-2026-5172"},{"category":"external","summary":"https://nvd.nist.gov/vuln/detail/CVE-2026-5172","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5172"},{"category":"external","summary":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html","url":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"}],"release_date":"2026-05-09T00:00:00+00:00","remediations":[{"category":"vendor_fix","date":"2026-05-19T16:15:41+00:00","details":"For details on how to apply this update, which includes the changes described in this advisory, refer 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