CVE-2026-3592: ISC BIND

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

Affected products

• ISC BIND: from 9.11.0, up to and including 9.16.50; from 9.18.0, before 9.18.49 (fixed in 9.18.49); from 9.20.0, before 9.20.23 (fixed in 9.20.23); from 9.21.0, before 9.21.22 (fixed in 9.21.22)

Published 2026-05-20. Last modified 2026-07-24.