{"id":"CVE-2026-81736","title":"If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response.\nThis issue affects BIND 9 versions 9.18.0 t…","summary":"If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response.\nThis issue affects BIND 9 versions 9.18.0 t…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-1050","CWE-606"],"vendor":"ISC","product":"BIND 9","affected":["bind_9 >= 9.18.0 <= 9.18.50","bind_9 >= 9.20.0 <= 9.20.27","bind_9 >= 9.21.0 <= 9.21.25","bind_9 >= 9.18.11-S1 <= 9.18.50-S1","bind_9 >= 9.20.9-S1 <= 9.20.27-S1"],"published":"2026-09-16","updated":"2026-09-17","sourceUpdated":"2026-09-17T19:17:03.880","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81736","references":[{"url":"https://downloads.isc.org/isc/bind9/9.20.29","label":"security-officer@isc.org"},{"url":"https://downloads.isc.org/isc/bind9/9.21.26","label":"security-officer@isc.org"},{"url":"https://kb.isc.org/docs/cve-2026-81736","label":"security-officer@isc.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81736.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-81736"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2535432"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81736"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81736"},{"url":"https://access.redhat.com/errata/RHSA-2026:68279"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-17T18:45:52.174550Z"},"ingestedAt":"2026-09-16T13:56:12.614Z","epss":0.00486,"epssPercentile":0.40828,"patched":["hardened_images"],"slug":"CVE-2026-81736","body":"## Overview\n\nIf a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81736.json)\n- **RHSA-2026:68279** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68279)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}