CVE-2026-1519: ISC BIND

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1.

Affected products

• ISC BIND: from 9.11.0, up to and including 9.16.50; from 9.18.0, before 9.18.47 (fixed in 9.18.47); from 9.20.0, before 9.20.21 (fixed in 9.20.21); from 9.21.0, before 9.21.20 (fixed in 9.21.20)

Published 2026-03-25. Last modified 2026-09-17.