CVE-2026-19662

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.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

No configuration.

History

26 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Un atacante podría provocar que un resolver “named” se abortara. El ataque requiere inducir al resolver víctima a enviar múltiples consultas para una zona firmada con DNSSEC alojada en un servidor autoritativo bajo el control del atacante. Si la autoridad responde con una secuencia particular de respuestas manipuladas, y esas respuestas llegan en un orden específico con una temporización particular, el resolver “named” encontrará un error de uso después de liberación y se abortará. \nEste problema afecta a BIND?9 desde la versión?9.11.0 hasta la versión?9.18.50 incluida, desde la versión?9.20.0 hasta la versión?9.20.27 incluida, desde la versión?9.11.3?S1 hasta la versión?9.18.50?S1 incluida, y desde la versión?9.20.9?S1 hasta la versión?9.20.27?S1 incluida.

16 Sep 2026, 14:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-16 14:17

Updated : 2026-10-26 21:10

NVD link : CVE-2026-19662

Mitre link : CVE-2026-19662

CVE.ORG link : CVE-2026-19662

JSON object : View

Products Affected

No product.

CWE

CWE-416

Use After Free

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