Description (CNA)
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, 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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| ISC / BIND 9 | affected 9.11.0 through 9.18.50; affected 9.20.0 through 9.20.24; affected 9.21.0 through 9.21.23; affected 9.11.3-S1 through 9.18.50-S1; affected 9.20.9-S1 through 9.20.24-S1 |
CWE
CWE-1284
References
- https://kb.isc.org/docs/cve-2026-11721
- https://downloads.isc.org/isc/bind9/9.20.26
- https://downloads.isc.org/isc/bind9/9.21.24
ADP enrichment
No English description supplied.
No references supplied.