CVE-2026-81736

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.

  • Published Sep 16, 2026
  • CVSS 7.5 high
  • 0.6% chance of exploitation in the next 30 days (EPSS)

Affected software

In the news

CVE-2026-81736 at the National Vulnerability Database