{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93009","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","state":"PUBLISHED","assignerShortName":"redhat","dateReserved":"2026-09-17T14:35:34.562Z","datePublished":"2026-10-29T13:13:34.504Z","dateUpdated":"2026-10-30T08:05:48.784Z"},"containers":{"cna":{"title":"Dnsmasq: dnsmasq: heap out-of-bounds read in dhcpv6 option 39 fqdn decoder","metrics":[{"other":{"content":{"value":"Low","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"A flaw was found in dnsmasq. The DHCPv6 client hostname parser can read one byte past the end of a crafted FQDN option because it checks the next label length before confirming the pointer is still inside the option. An attacker on the local network can trigger this with a single DHCPv6 packet. The extra byte is not returned to the client or logged, and no crash has been demonstrated."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Ceph Storage 9","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhceph/alloy-rhel10","defaultStatus":"affected","cpes":["cpe:/a:redhat:ceph_storage:9"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"dnsmasq","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"dnsmasq","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:6"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"dnsmasq","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"dnsmasq","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"dnsmasq","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:9"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift4/ose-baremetal-runtimecfg-rhel8","defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:4"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift4/ose-baremetal-runtimecfg-rhel9","defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:4"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift/ose-rhel-coreos-8","defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:4"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift/ose-rhel-coreos-9","defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:4"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 5","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift5/ose-baremetal-runtimecfg-rhel9","defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:5"]},{"vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 5","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"openshift/ose-rhel-coreos-9","defaultStatus":"affected","cpes":["cpe:/a:redhat:openshift:5"]},{"vendor":"Red Hat","product":"Red Hat OpenStack Platform 13 (Queens)","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"dnsmasq","defaultStatus":"affected","cpes":["cpe:/a:redhat:openstack:13"]},{"vendor":"Red Hat","product":"Red Hat OpenStack Platform 18.0","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhoso-operators/infra-rhel9-operator","defaultStatus":"affected","cpes":["cpe:/a:redhat:openstack:18.0"]}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-93009","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536083","name":"RHBZ#2536083","tags":["issue-tracking","x_refsource_REDHAT"]}],"datePublic":"2026-10-28T09:30:00.000Z","problemTypes":[{"descriptions":[{"cweId":"CWE-125","description":"Out-of-bounds Read","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-125: Out-of-bounds Read","workarounds":[{"lang":"en","value":"The following measures reduce risk:\n\n1. If DHCPv6 is not required, do not configure any IPv6 dhcp-range.\n2. Compile without DHCPv6 using COPTS=-DNO_DHCP6 if IPv6 DHCP is not needed.\n3. Restrict dnsmasq to trusted interfaces with --interface=<iface>."}],"timeline":[{"lang":"en","time":"2026-09-14T00:00:00.000Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-10-28T09:30:00.000Z","value":"Made public."}],"credits":[{"lang":"en","value":"Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2026-10-30T08:05:48.784Z"},"x_generator":{"engine":"cvelib 1.8.0"}}}}