{"affected":[{"conditional":false,"product":"bind","source":"NVD","vendor":"isc","versions":[{"greaterThanOrEqual":"9.11.0","lessThanOrEqual":"9.18.50","status":"affected","version":"*","versionType":"custom"}]},{"conditional":false,"product":"bind","source":"NVD","vendor":"isc","versions":[{"greaterThanOrEqual":"9.11.3","lessThanOrEqual":"9.18.50","status":"affected","version":"*","versionType":"custom"}]},{"conditional":false,"product":"bind","source":"NVD","vendor":"isc","versions":[{"greaterThanOrEqual":"9.20.0","lessThanOrEqual":"9.20.24","status":"affected","version":"*","versionType":"custom"}]},{"conditional":false,"product":"bind","source":"NVD","vendor":"isc","versions":[{"greaterThanOrEqual":"9.20.9","lessThanOrEqual":"9.20.24","status":"affected","version":"*","versionType":"custom"}]},{"conditional":false,"product":"bind","source":"NVD","vendor":"isc","versions":[{"greaterThanOrEqual":"9.21.0","lessThanOrEqual":"9.21.23","status":"affected","version":"*","versionType":"custom"}]}],"cpeConfigurations":[{"negate":false,"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*","versionEndIncluding":"9.18.50","versionStartIncluding":"9.11.0","vulnerable":true},{"criteria":"cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*","versionEndIncluding":"9.18.50","versionStartIncluding":"9.11.3","vulnerable":true},{"criteria":"cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*","versionEndIncluding":"9.20.24","versionStartIncluding":"9.20.0","vulnerable":true},{"criteria":"cpe:2.3:a:isc:bind:*:*:*:*:supported_preview:*:*:*","versionEndIncluding":"9.20.24","versionStartIncluding":"9.20.9","vulnerable":true},{"criteria":"cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*","versionEndIncluding":"9.21.23","versionStartIncluding":"9.21.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"cveId":"CVE-2026-11721","cwes":["CWE-1284"],"description":"It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes `named` to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For this attack to have any effect, the resolver under attack must have set `synth-from-dnssec yes;` (which is the default).\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":7.5,"severity":"high","source":"NVD: security-officer@isc.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}],"modifiedAt":1793641242150,"publishedAt":1784733411837,"references":[{"source":"security-officer@isc.org","tags":["Product"],"url":"https://downloads.isc.org/isc/bind9/9.20.26"},{"source":"security-officer@isc.org","tags":["Product"],"url":"https://downloads.isc.org/isc/bind9/9.21.24"},{"source":"security-officer@isc.org","tags":["Vendor Advisory"],"url":"https://kb.isc.org/docs/cve-2026-11721"}],"remediation":[],"revision":"3a407553fbddd9dc0425159908612d587143bf5f952acff87a76b02e6a4b2eed","sources":[{"modifiedAt":1793641242150,"name":"NVD","retrievedAt":1793643361061,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11721"}],"ssvc":{"assessedAt":1784746355390,"automatable":"yes","exploitation":"none","source":"NVD SSVC: 134c704f-9b21-4f2e-91b3-4a467353bcc0","technicalImpact":"partial"},"status":"published","title":"CVE-2026-11721","updatedAt":1793643361061}