high7.5
CVE-2026-81563
A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal reso…
Impact
A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal resources. If this happens repeatedly, resource exhaustion will eventually prevent the resolver from performing new recursive lookups. This 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.
Affected products
| Product | Affected versions |
|---|---|
| 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. |
Versions were read from the advisory text. No structured product data has been published for this record yet.