{"document":{"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"TuxCare License Agreement","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 Cloud Linux Inc. and provide a link to the original.","title":"Terms of Use"}],"publisher":{"category":"vendor","contact_details":"https://tuxcare.com/contact/","name":"TuxCare","namespace":"https://tuxcare.com/"},"references":[{"category":"self","summary":"Canonical URL","url":"https://security.tuxcare.com/csaf/v2/els_os/ubuntu20.04els/vex/2026/cve-2026-10723-els_os-ubuntu20_04els.json"}],"title":"Security update on CVE-2026-10723","tracking":{"current_release_date":"2026-10-15T19:08:53Z","generator":{"date":"2026-10-15T19:08:53Z","engine":{"name":"pyCSAF"}},"id":"CVE-2026-10723-ELS_OS-UBUNTU20.04ELS","initial_release_date":"2026-07-22T15:16:00Z","revision_history":[{"date":"2026-07-22T15:16:00Z","number":"1","summary":"Initial version"},{"date":"2026-10-13T10:12:19Z","number":"2","summary":"Official Publication"},{"date":"2026-10-13T16:56:07Z","number":"3","summary":"Update 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description"}],"product_status":{"known_affected":["Ubuntu-20:bind9-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9-dnsutils-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9-doc-1:9.18.30-0ubuntu0.20.04.2.all","Ubuntu-20:bind9-host-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9-libs-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9-utils-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9utils-1:9.18.30-0ubuntu0.20.04.2.all","Ubuntu-20:dnsutils-1:9.18.30-0ubuntu0.20.04.2.all"],"under_investigation":["Ubuntu-20:bind9-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9-dnsutils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-dnsutils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9-doc-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.all","Ubuntu-20:bind9-doc-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.all","Ubuntu-20:bind9-host-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-host-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9-libs-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-libs-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9-utils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-utils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9utils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.all","Ubuntu-20:bind9utils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.all","Ubuntu-20:dnsutils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.all","Ubuntu-20:dnsutils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.all"]},"references":[{"category":"self","summary":"Canonical URL","url":"https://cve.tuxcare.com/els/cve/CVE-2026-10723"},{"category":"external","summary":"https://downloads.isc.org/isc/bind9/9.20.26","url":"https://downloads.isc.org/isc/bind9/9.20.26"},{"category":"external","summary":"https://downloads.isc.org/isc/bind9/9.21.24","url":"https://downloads.isc.org/isc/bind9/9.21.24"},{"category":"external","summary":"https://kb.isc.org/docs/cve-2026-10723","url":"https://kb.isc.org/docs/cve-2026-10723"}],"release_date":"2026-07-22T15:16:00Z","remediations":[{"category":"no_fix_planned","date":"2026-10-13T10:58:44.504363Z","details":"This issue only affects DNSSEC-validating resolvers and requires an attacker to control a DNSSEC-signed child zone and craft specific NSEC3 records so they are misinterpreted as parent-zone closest-encloser proofs, making the attack path complex and specialized. Even if triggered, the impact is limited to forged NXDOMAIN answers (no code execution or privilege escalation), and any poisoning is constrained by negative-caching limits (max-ncache-ttl is 3 hours by default), which naturally caps scope and duration. With these strict prerequisites and no reported in-the-wild exploitation, it represents low operational risk for centrally managed enterprise resolvers and can be safely deprioritized.","product_ids":["Ubuntu-20:bind9-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9-dnsutils-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9-doc-1:9.18.30-0ubuntu0.20.04.2.all","Ubuntu-20:bind9-host-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9-libs-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9-utils-1:9.18.30-0ubuntu0.20.04.2.amd64","Ubuntu-20:bind9utils-1:9.18.30-0ubuntu0.20.04.2.all","Ubuntu-20:dnsutils-1:9.18.30-0ubuntu0.20.04.2.all"]},{"category":"none_available","date":"2026-10-15T08:17:33.922703Z","details":"Affected","product_ids":["Ubuntu-20:bind9-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9-dnsutils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-dnsutils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9-doc-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.all","Ubuntu-20:bind9-doc-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.all","Ubuntu-20:bind9-host-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-host-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9-libs-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-libs-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9-utils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.amd64","Ubuntu-20:bind9-utils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.amd64","Ubuntu-20:bind9utils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.all","Ubuntu-20:bind9utils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.all","Ubuntu-20:dnsutils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els2.all","Ubuntu-20:dnsutils-1:9.18.30-0ubuntu0.20.04.2+tuxcare.els3.all"]}]}]}