CVE-2026-19662
qpcache NOQNAME proof use-after-free crashes recursive resolver
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | isc |
| Product | bind 9 |
| Published | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ISC / BIND 9
9.11.0 ≤ 9.18.50 9.20.0 ≤ 9.20.27 9.11.3-S1 ≤ 9.18.50-S1 9.20.9-S1 ≤ 9.20.27-S1
References
Credits
ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention.