Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Isc | Bind | >= 9.11.0, <= 9.16.50 |
Related Weaknesses (CWE)
References
- https://downloads.isc.org/isc/bind9/9.18.47Patch
- https://downloads.isc.org/isc/bind9/9.20.21Patch
- https://downloads.isc.org/isc/bind9/9.21.20Patch
- https://kb.isc.org/docs/cve-2026-1519Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2026/04/msg00008.htmlIssue TrackingThird Party Advisory
FAQ
What is CVE-2026-1519?
CVE-2026-1519 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ther...
How severe is CVE-2026-1519?
CVE-2026-1519 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-1519?
Check the references section above for vendor advisories and patch information. Affected products include: Isc Bind.