Is CVE-2026-11605 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-11605 being exploited in the wild.

How severe is CVE-2026-11605?

High severity, with a CVSS score of 7.5, published 22 July 2026.

Which products and versions are affected?

Isc BIND 9 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.20.9-S1 through 9.20.24-S1.

Is there a fix for CVE-2026-11605?

A patch was published on 2026-07-22: Patched versions 9.20.26 and 9.21.24 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-11605 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-11605?

Check whether you run Isc BIND 9 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-11605: ISC BIND 9 resource exhaustion in DNSSEC validation

CVE-2026-11605 · Severity: high · CVSS 7.5 · Published 2026-07-22

A resource exhaustion vulnerability exists in BIND 9, a widely used software for translating domain names into IP addresses. An attacker can send a specially crafted DNS query that forces the server to perform excessive and unnecessary security checks, consuming high amounts of CPU power. This can lead to a denial-of-service, making the DNS server slow or completely unresponsive to legitimate user requests.

Technologies: Isc BIND 9. Vendors: Isc.

Quick answers

Is CVE-2026-11605 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-11605 being exploited in the wild.
How severe is CVE-2026-11605?: High severity, with a CVSS score of 7.5, published 22 July 2026.
Which products and versions are affected?: Isc BIND 9 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.20.9-S1 through 9.20.24-S1.
Is there a fix for CVE-2026-11605?: A patch was published on 2026-07-22: Patched versions 9.20.26 and 9.21.24 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-11605 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-11605?: Check whether you run Isc BIND 9 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A resource exhaustion vulnerability exists in BIND 9's DNSSEC validation logic. The resolver incorrectly attempts to validate all RRSIG records provided in an answer, even those that are not required for a successful validation. By querying an authoritative server that returns a large number of valid but unnecessary RRSIG records, a remote attacker can cause the BIND validator to consume disproportionate CPU resources. This is classified as an early amplification/incorrect behavior order issue (CWE-408). Patches are available in versions 9.20.26, 9.21.24, and 9.20.26-S1.

Affected products

ISC BIND 9 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.20.9-S1 through 9.20.24-S1

Timeline

2026-07-15: other: Early notification provided
2026-07-22: disclosed: Public disclosure
2026-07-22: patched: Patched versions 9.20.26 and 9.21.24 released

References

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