Cyber Resilience

CVE-2026-42004

Published
25 June 2026
Modified
25 June 2026
CVSS Score v3.1 3.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS Score 0.0016 5th percentile
Risk Priority 30 floored blend · peak EPSS

Summary

CVE-2026-42004 is a low-severity Misinterpretation of Input (CWE-115) vulnerability in Dnsdist (inferred from references). Its CVSS base score is 3.7 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Masquerading (T1036); ranked at the 5th 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 SI-10 (Information Input Validation) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s)…

more

that DNSdist did not filter.

CWE(s)
CWE-115

Related Threats

MITRE ATT&CK Enterprise Techniques

T1036 Masquerading Stealth
Adversaries may attempt to manipulate features of their artifacts to make them appear legitimate or benign to users and/or security tools.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1204 User Execution Execution
An adversary may rely upon specific actions by a user in order to gain execution.
attack.mitre.org →
T1221 Template Injection Stealth
Adversaries may create or modify references in user document templates to conceal malicious code or force authentication attempts.
attack.mitre.org →
T1659 Content Injection Initial Access
Adversaries may gain access and continuously communicate with victims by injecting malicious content into systems through online network traffic.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-0880Shared CWE-115
CVE-2025-22870Shared CWE-115
CVE-2023-32228Shared CWE-115
CVE-2025-5747Shared CWE-115
CVE-2025-54584Shared CWE-115
CVE-2025-5826Shared CWE-115
CVE-2023-32260Shared CWE-115
CVE-2025-32908Shared CWE-115
CVE-2025-25069Shared CWE-115
CVE-2026-12491Shared CWE-115

Affected Assets

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

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

Input validation directly stops the system from accepting and acting on misinterpreted data values.

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.PS-06 mostly match
prevents

Secure SDLC practices directly require correct input parsing/validation to avoid misinterpretation flaws.

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.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect input misinterpretation flaws but does not itself implement the preventive controls.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle mandates input validation and canonicalization that directly prevent misinterpretation of inputs.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for robust input handling and sanitization to avoid misinterpretation.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles include defensive input processing and error handling that reduce misinterpretation risks.

A.8.28 Secure coding partial match
prevents

Secure coding standards require strict input validation and canonical forms to eliminate misinterpretation vulnerabilities.

References