Cyber Resilience

CVE-2026-81736

Published
16 September 2026
Modified
16 September 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 0.0049 41th percentile
Risk Priority 58 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-81736 is a high-severity Excessive Platform Resource Consumption within a Loop (CWE-1050) vulnerability in Isc (inferred from references). Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked at the 41th 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-10 (Concurrent Session Control) and SA-11 (Developer Testing and Evaluation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response. This issue affects BIND 9 versions 9.18.0 through…

more

9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

CWE(s)
CWE-1050

Related Threats

MITRE ATT&CK Enterprise Techniques

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 →
T1499.001 OS Exhaustion Flood Impact
Adversaries may launch a denial of service (DoS) attack targeting an endpoint's operating system (OS).
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.

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)
  • 2 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V2.4.1
  • V7.6.2
  • V15.4.3
  • V15.4.4

Mitigating Controls (NIST 800-53 r5) AI

AC-10 Concurrent Session Control partial match

AC-10 caps concurrent sessions, reducing blast radius when a loop consumes session or connection resources.

SA-11 Developer Testing and Evaluation partial match

SA-11 developer testing can discover loops that consume platform resources before deployment.

SC-5 Denial-of-service Protection partial match

SC-5 limits effects of DoS events that can result from unbounded resource consumption inside loops.

SC-6 Resource Availability partial match

SC-6 directly protects resource availability by enforcing allocation limits that bound consumption from faulty loops.

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.

DE.CM-09 partial match
prevents

Runtime monitoring can detect excessive resource use from loops as an adverse event.

PR.IR-04 partial match
prevents

Capacity monitoring and resource management directly limit impact of runaway consumption.

PR.PS-06 partial match
prevents

Secure SDLC practices can prevent introduction of unbounded loops during development.

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.8.14 Redundancy of information processing facilities partial match
mitigates

Redundancy can absorb some resource spikes but does not prevent the loop defect.

A.8.15 Logging partial match
finds

Logging may detect excessive consumption but does not stop the loop.

A.8.16 Monitoring activities partial match
finds

Monitoring can alert on resource abuse but does not eliminate the coding flaw.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC processes can catch the weakness during reviews but do not inherently prevent it.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly forbid resource-consuming loops.

A.8.29 Security testing in development and acceptance partial match
finds

Security testing can discover the defect but does not remove it from production code.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (higher-evidence rows only; rows rated `none` are excluded).

Oracle Linux 9 (1 rule)
  • V-271709 OL 9 must be configured so that all network connections associated with SSH traffic terminate after becoming unresponsive. prevents CWE-1050
RHEL 9 (1 rule)
  • V-257995 RHEL 9 must be configured so that all network connections associated with SSH traffic terminate after becoming unresponsive. prevents CWE-1050

References