CVE-2026-81736
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response. 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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ISC | BIND 9 | 9.18.0 <= 9.18.50 | affected |
| ISC | BIND 9 | 9.20.0 <= 9.20.27 | affected |
| ISC | BIND 9 | 9.21.0 <= 9.21.25 | affected |
| ISC | BIND 9 | 9.18.11-S1 <= 9.18.50-S1 | affected |
| ISC | BIND 9 | 9.20.9-S1 <= 9.20.27-S1 | affected |
Weaknesses
- CWE-1050: CWE-1050 Excessive Platform Resource Consumption within a Loop
Workarounds
No workarounds known.
References
- https://kb.isc.org/docs/cve-2026-81736
- https://downloads.isc.org/isc/bind9/9.20.29
- https://downloads.isc.org/isc/bind9/9.21.26
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