CVE-2026-1519: Excessive NSEC3 iterations cause high CPU load during insecure delegation validation
CSIRTS triage
- What
- Excessive NSEC3 iteration counts in DNS responses cause high CPU load during validation of insecure delegations.
- Who is affected
- BIND DNS servers and resolvers performing DNSSEC validation of zones with high NSEC3 iteration counts.
- Urgency
- High severity (CVSS 7.5) denial of service requiring prompt remediation to prevent resolver exhaustion.
- Action
- Update BIND to patched version implementing limits on NSEC3 iteration processing or validation bypass.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-1519
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Moderate exploitation riskCVE-2026-15191.6% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 74% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-1519 | coverage & exploitation status | NVD · CVE.org |
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