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Multiple Vulnerabilities in ISC BIND

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

ISC BIND versions 9.11.0 through 9.16.50

ISC BIND versions 9.18.0 through 9.18.46

ISC BIND versions 9.20.0 through 9.20.20

ISC BIND versions 9.21.0 through 9.21.19

ISC BIND Supported Preview Edition 9.11.3.S1 through 9.16.50.S1

ISC BIND Supported Preview Edition 9.18.11.S1 through 9.18.46.S1

ISC BIND Supported Preview Edition 9.20.9.S1 through 9.20.20.S1

Note: (Versions prior to 9.11.0 were not assessed.)

Overview

Multiple vulnerabilities have been reported in ISC BIND which could allow a remote attacker to cause CPU exhaustion, which could lead to Denial of Service (DoS), ACL bypass, unauthorized access or memory leak on the targeted system.

Target Audience:

All end-user organizations and individuals using ISC BIND.

Risk Assessment:

Risk of remote code execution, denial of service, unauthorized access and memory leak.

Impact Assessment:

Authoritative servers and Resolvers are affected by these vulnerabilities.

Description

ISC BIND is an open-source software that implements the Domain Name System (DNS) protocols for resolving domain names to IP addresses.

Multiple vulnerabilities exist in ISC BIND which could allow a remote attacker to cause excessive CPU utilization, ACL bypass, unauthorized access and/or memory leak on the targeted server with specially crafted requests.

Successful exploitation of these vulnerabilities could allow a remote attacker to trigger denial of service condition, gain elevated privileges and memory leak on the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor:

https://kb.isc.org/docs/cve-2026-1519

https://kb.isc.org/docs/cve-2026-3591

https://kb.isc.org/docs/cve-2026-3119

https://kb.isc.org/docs/cve-2026-3104

Vendor Information

ISC BIND

https://kb.isc.org/

References

ISC BIND

https://kb.isc.org/docs/cve-2026-1519

https://kb.isc.org/docs/cve-2026-3591

https://kb.isc.org/docs/cve-2026-3119

https://kb.isc.org/docs/cve-2026-3104

CVE Name

CVE-2026-1519

CVE-2026-3591

CVE-2026-3119

CVE-2026-3104

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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