Cyber Resilience

CVE-2026-42002

Medium

Published: 21 May 2026

Published
21 May 2026
Modified
26 May 2026
KEV Added
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Patch
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CVSS Score v3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0035 27.1th percentile
Risk Priority 12 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-42002 is a medium-severity Signal Handler Race Condition (CWE-364) vulnerability in Powerdns Authoritative. Its CVSS base score is 5.9 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 27.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Concurrency and locking defects in GSS-TSIG

CWE(s)
CWE-364

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

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 →
Why these techniques?

Race condition in GSS-TSIG (DNS auth) directly enables remote exploitation of public-facing DNS servers.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

Affected Assets

powerdns
authoritative
4.7.0 — 4.9.15 · 5.0.0 — 5.0.5

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References