What is CVE-2026-42002?

CVE-2026-42002 is a medium-severity vulnerability in Powerdns Authoritative, classified under Signal Handler Race Condition. CVSS score: 5.9/10. Published 2026-05-21.

How severe is CVE-2026-42002?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Powerdns Authoritative

CVE-2026-42002

Concurrency and locking defects in GSS-TSIG

Published 2026-05-21 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.6th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003

Affected products

Powerdns Authoritative — versions 4.9.0, 5.0.0

Weakness classification (CWE)

CWE-364 — Signal Handler Race Condition

References

docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-… (Broken Link)

Frequently asked questions

What is CVE-2026-42002?: CVE-2026-42002 is a medium-severity vulnerability in Powerdns Authoritative, classified under Signal Handler Race Condition. CVSS score: 5.9/10. Published 2026-05-21.
How severe is CVE-2026-42002?: Medium severity. CVSS v3 base score is 5.9 out of 10.