High 7.5Published Sep 16, 2026

CVE-2026-19666Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path

Updated under an hour ago (2026-10-19 07:10 UTC)

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It affects ISC BIND 9. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ISC BIND 9

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: isc
NVD analysis: Awaiting Analysis
Record last updated: Sep 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ISC BIND 9 isc:bind_9 (from the name)	from 9.11.0 through 9.18.50; from 9.20.0 through 9.20.27; from 9.21.0 through 9.21.25; from 9.11.3-S1 through 9.18.50-S1; from 9.20.9-S1 through 9.20.27-S1	CNA record

References

https://kb.isc.org/docs/cve-2026-19666vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.29patch
https://downloads.isc.org/isc/bind9/9.21.26patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.