7.5 HighCWE-606
CVE-2026-1519
Excessive NSEC3 iterations cause high CPU load during insecure delegation validation
ISCBIND 9
Status
- Not in CISA KEV
- Vendor fix available
Exploit probabilityEPSSchecked 25 Oct
1.7%probability of exploitation in the next 30 days
Higher than 77% of scored CVEs
SeverityCVSS
7.5High
Description NVD
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.
Coverage 1 article · 1 outlet
- BIND Updates Patch High-Severity VulnerabilitiesSecurityWeek · first in our coverage · mentions it in passing