Cyber Resilience

CVE-2026-11605

Published
22 July 2026
Modified
22 July 2026
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0052 42th percentile
Risk Priority 58 floored blend · peak EPSS

Summary

CVE-2026-11605 is a high-severity Incorrect Behavior Order: Early Amplification (CWE-408) vulnerability in Isc (inferred from references). Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Network Denial of Service (T1498); ranked at the 42th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-14 (Permitted Actions Without Identification or Authentication) and AC-3 (Access Enforcement) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG…

more

records causes the validator to waste disproportionate CPU time. This issue affects BIND 9 versions 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, and 9.20.9-S1 through 9.20.24-S1.

CWE(s)
CWE-408

Related Threats

MITRE ATT&CK Enterprise Techniques

T1498 Network Denial of Service Impact
Adversaries may perform Network Denial of Service (DoS) attacks to degrade or block the availability of targeted resources to users.
attack.mitre.org →
T1498.002 Reflection Amplification Impact
Adversaries may attempt to cause a denial of service (DoS) by reflecting a high-volume of network traffic to a target.
attack.mitre.org →
T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
T1499.002 Service Exhaustion Flood Impact
Adversaries may target the different network services provided by systems to conduct a denial of service (DoS).
attack.mitre.org →
T1499.003 Application Exhaustion Flood Impact
Adversaries may target resource intensive features of applications to cause a denial of service (DoS), denying availability to those applications.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-41374Shared CWE-408
CVE-2026-3592Shared CWE-408
CVE-2026-41331Shared CWE-408
CVE-2026-41405Shared CWE-408

Affected Assets

Isc
—
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 4 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-14 Permitted Actions Without Identification or Authentication good match

Explicitly identifies and limits actions permitted without identification or authentication, directly stopping early expensive operations.

AC-3 Access Enforcement good match

Access enforcement requires authorization checks before any operation, structurally blocking expensive actions prior to authentication.

IA-2 Identification and Authentication (Organizational Users) good match

Requires unique identification and authentication of users before associating privileges, preventing unauthenticated expensive work.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-03 mostly match
prevents

Enforcing authentication before operations directly blocks the early expensive action described by the CWE.

PR.AA-05 mostly match
prevents

Policy-driven authorization enforcement prevents costly actions prior to proper access decisions.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.15 Access control partial match
prevents

Access control policies that enforce authentication before resource-intensive operations directly prevent early amplification.

A.5.16 Identity management partial match
degrades

Identity management ensures entities are identified and authenticated prior to performing expensive actions.

A.5.18 Access rights partial match
prevents

Access rights provisioning can restrict expensive operations until authorization is granted.

A.8.2 Privileged access rights partial match
prevents

Privileged access rights limit who can perform costly actions but do not enforce authentication order.

A.8.3 Information access restriction partial match
prevents

Information access restriction mechanisms can block resource-intensive operations until authentication succeeds.

A.8.5 Secure authentication partial match
prevents

Secure authentication ensures identity verification occurs before expensive operations are allowed.

References