Is CVE-2026-81736 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-81736?

CVE-2026-81736 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-81736

Description

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.