CVE-2026-19662 — qpcache NOQNAME proof use-after-free crashes recursive resolver

Description (CNA)

An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

Affected (CNA)

Vendor / product	Versions
ISC / BIND 9	affected 9.11.0 through 9.18.50; affected 9.20.0 through 9.20.27; affected 9.11.3-S1 through 9.18.50-S1; affected 9.20.9-S1 through 9.20.27-S1

CWE

CWE-416

References

https://kb.isc.org/docs/cve-2026-19662
https://downloads.isc.org/isc/bind9/9.20.29

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.