CVE Explorer
CVE-2026-11721
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).
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"BIND 9","vendor":"ISC","versions":[{"lessThanOrEqual":"9.18.50","status":"affected","version":"9.11.0","versionType":"custom"},{"lessThanOrEqual":"9.20.24","status":"affected","version":"9.20.0","versionType":"custom"},{"lessThanOrEqual":"9.21.23","status":"affected","version":"9.21.0","versionType":"custom"},{"lessThanOrEqual":"9.18.50-S1","status":"affected","version":"9.11.3-S1","versionType":"custom"},{"lessThanOrEqual":"9.20.24-S1","status":"affected","version":"9.20.9-S1","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:62406063e4a6dda9fc9de750ca852488a79b8253c5512c3819d9518508ae712a · sha256:f0eaf98081957616… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:62406063e4a6dda9fc9de750ca852488a79b8253c5512c3819d9518508ae712a · sha256:f0eaf98081957616… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-1284","description":"CWE-1284 Improper Validation of Specified Quantity in Input","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:62406063e4a6dda9fc9de750ca852488a79b8253c5512c3819d9518508ae712a · sha256:f0eaf98081957616… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.20.26"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:62406063e4a6dda9fc9de750ca852488a79b8253c5512c3819d9518508ae712a · sha256:f0eaf98081957616… · /containers/cna/references/1
{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.21.24"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:62406063e4a6dda9fc9de750ca852488a79b8253c5512c3819d9518508ae712a · sha256:f0eaf98081957616… · /containers/cna/references/2
{"name":"CVE-2026-11721","tags":["vendor-advisory"],"url":"https://kb.isc.org/docs/cve-2026-11721"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:62406063e4a6dda9fc9de750ca852488a79b8253c5512c3819d9518508ae712a · sha256:f0eaf98081957616… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.