VDB
CVE-2026-81563
CVE-2026-81563
PUBLISHED
CVSS 7.5 HIGH
Reported by isc · Published September 16, 2026
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| ISC | BIND 9 | 9.18.0, 9.20.0, 9.21.0 |
| ISC | BIND 9 | 9.20.9-S1, 9.18.0, 9.20.0 |
| isc | bind | 9.18.0, 9.20.0, 9.21.0 |
Timeline
- Sep 16, 2026 Coalition ESS Score
- Sep 16, 2026 CVE Published
References
- CVE-2026-81563 vendor-advisory
- patch
- patch