Resource exhaustion in Isc Bind
CVE-2026-1519
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.
EPSS: 0.016 (74.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Isc Bind
- Isc Bind 9 — versions 9.11.0, 9.18.0, 9.20.0
Weakness classification (CWE)
References
- security-officer@isc.org (vendor-advisory, Vendor Advisory)
- security-officer@isc.org (Patch, patch)
- security-officer@isc.org (Patch, patch)
- security-officer@isc.org (Patch, patch)
- af854a3a-2127-422b-91ae-364da2661108 (Issue Tracking, Third Party Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-1519?
- CVE-2026-1519 is a high-severity vulnerability in Isc Bind, classified under CWE-606. CVSS score: 7.5/10. Published 2026-03-25.
- How severe is CVE-2026-1519?
- High severity. CVSS v3 base score is 7.5 out of 10.