Resource Exhaustion Vulnerability in BIND by ISC
CVE-2026-19630

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
21 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-19630?

A resource exhaustion vulnerability exists in BIND that can be triggered by inbound DNS protocol messages crafted in a specific manner. These messages can lead to excessive consumption of CPU and memory resources, as BIND processes an unchecked quantity of such messages, potentially impacting the stability and performance of the DNS resolver. The flaw affects several versions of BIND 9, necessitating prompt attention to patching.

Affected Version(s)

BIND 9 9.11.0 <= 9.18.50

BIND 9 9.20.0 <= 9.20.29

BIND 9 9.21.0 <= 9.21.26

References

https://kb.isc.org/docs/cve-2026-19630
vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.30
patch
https://downloads.isc.org/isc/bind9/9.21.27
patch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.