CVE-2026-19666 in BIND 9

Summary

by MITRE • 09/16/2026

On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

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• Responsible: Isc
• Reservation: 08/12/2026
• Disclosure: 09/16/2026
• Moderation: accepted
• Entry: VDB-405959
• CPE: ready
• CWE: CWE-20 (confirmed)
• CVSS: 7.5 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Finance, Hostingprovider, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-19666
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19666
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-19666/