Resource Exhaustion Vulnerability in BIND by ISC
CVE-2026-11605

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
22 July 2026

Badges

👾 Exploit Exists

What is CVE-2026-11605?

A resource exhaustion vulnerability has been identified in BIND, where the software unnecessarily validates all RRSIG records included in DNS responses, leading to excessive CPU usage. When a user queries an authoritative server that returns a large number of valid but redundant RRSIG records, BIND can become overwhelmed, resulting in degraded performance. This issue primarily impacts certain versions of BIND 9, affecting its efficiency and reliability in handling DNS resolution tasks.

Affected Version(s)

BIND 9 9.20.0 <= 9.20.24

BIND 9 9.21.0 <= 9.21.23

BIND 9 9.20.9-S1 <= 9.20.24-S1

References

https://kb.isc.org/docs/cve-2026-11605
vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.26
patch
https://downloads.isc.org/isc/bind9/9.21.24
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

.