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

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-26
• Weakness: CWE-416

Description

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 products

• ISC BIND: from 9.11.0 through 9.18.50; from 9.20.0 through 9.20.27; from 9.11.3-S1 through 9.18.50-S1; from 9.20.9-S1 through 9.20.27-S1

References

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

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