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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 9.18.48

ISC BIND versions 9.20.0 through 9.20.22

ISC BIND versions 9.21.0 through 9.21.21

ISC BIND Supported Preview Edition versions 9.11.3-S1 through 9.16.50-S1

ISC BIND Supported Preview Edition versions 9.18.11-S1 through 9.18.48-S1

ISC BIND Supported Preview Edition versions 9.20.9-S1 through 9.20.22-S1

Overview

Multiple vulnerabilities have been reported in ISC BIND which could allow a remote attacker to cause use-after-free condition, disproportionate bandwidth consumption, Denial of Service (DoS), unauthorized access, memory corruption or undefined behavior on the targeted system.

Target Audience:

All end-user organizations and individuals using ISC BIND.

Risk Assessment:

Risk of unauthorized access, service disruption, resource exhaustion, memory corruption.

Impact Assessment:

Potential for application crashes, loss of DNS service availability, data exposure.

Description

ISC BIND is an open-source DNS server software package that provides both authoritative and recursive DNS services.

These vulnerabilities exist in ISC BIND due to improper handling of crafted DNS queries, memory management issues, and insufficient validation mechanism.

Successful exploitation of these vulnerabilities could allow an attacker which may lead to use-after-free condition, disproportionate bandwidth consumption, Denial of Service (DoS), unauthorized access, memory corruption or undefined behavior on the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor:

https://kb.isc.org/docs/cve-2026-3593

https://kb.isc.org/docs/cve-2026-5946

https://kb.isc.org/docs/cve-2026-3592

https://kb.isc.org/docs/cve-2026-5947

https://kb.isc.org/docs/cve-2026-5950

Vendor Information

ISC BIND

https://kb.isc.org/

References

ISC BIND

https://kb.isc.org/docs/cve-2026-3593

https://kb.isc.org/docs/cve-2026-5946

https://kb.isc.org/docs/cve-2026-5947

https://kb.isc.org/docs/cve-2026-5950

https://kb.isc.org/docs/cve-2026-3592

CVE Name

CVE-2026-3593

CVE-2026-5946

CVE-2026-3592

CVE-2026-5947

CVE-2026-5950

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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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