7.5

CVE-2026-42002: powerdns authoritative Signal Handler Race Condition

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-42002DEBIAN-CVE-2026-42002
Published 21-05-2026Last modified 21-05-2026
Open JSON

Vulnerability summary

CVE-2026-42002 is a high (CVSS 7.5) Signal Handler Race Condition vulnerability in powerdns authoritative. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.58%
0%100%
Low · +0.32 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 21-05-2026
    PublishedVulnerability first disclosed.
  2. 21-05-2026
    Last modifiedVulnerability information updated.

Description

Concurrency and locking defects in GSS-TSIG

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.58%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

+0.32 pp

From 0.26% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.58%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • pdnsAll versions (No fix recorded) | < 4.9.15-0+deb13u1 | < 5.0.5-1
Powerdns1 product
  • authoritative≥ 4.9.0, < 4.9.15 | ≥ 4.7.0, < 4.9.15 | ≥ 5.0.0, < 5.0.5
Ubuntu1 product
  • pdnsAll versions (No fix recorded)

3 vendors · 3 products

References

6 links