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CVE-2026-42002— Concurrency and locking defects in GSS-TSIG

Quick assessment

Affected
PowerDNS Authoritative
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PowerDNS Authoritative是PowerDNS公司的一个DNS服务器软件。 PowerDNS Authoritative存在安全漏洞，该漏洞源于GSS-TSIG存在并发和锁定缺陷。

CVSS 5.9 · Medium EPSS 0.58% · P46

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
PowerDNS Authoritative 4.9.0< 4.9.15 affected
5.0.0< 5.0.5 affected
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I. Basic Information for CVE-2026-42002

Vulnerability Information
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Vulnerability Title
Concurrency and locking defects in GSS-TSIG
Source: CVE Program / CVE List V5
Vulnerability Description
Concurrency and locking defects in GSS-TSIG
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PowerDNS Authoritative 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS Authoritative是PowerDNS公司的一个DNS服务器软件。 PowerDNS Authoritative存在安全漏洞，该漏洞源于GSS-TSIG存在并发和锁定缺陷。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PowerDNS Authoritative 4.9.0 ~ 4.9.15 -

II. Public POCs for CVE-2026-42002

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-42002

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Vendor Advisories for CVE-2026-42002 (1)

Same Patch Batch · PowerDNS · 2026-05-21 · 5 CVEs total

CVE-2026-42001 7.5 HIGH Insufficient Validation of Autoprimary SOA Queries
CVE-2026-42000 6.8 MEDIUM Insufficient Validation of Names During AXFR
CVE-2026-42396 4.9 MEDIUM Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail
CVE-2026-41999 4.8 MEDIUM Incorrect Behaviour of Views with TCP PROXY Requests

IV. Related Vulnerabilities

Same product: Authoritative
Same vendor: PowerDNS

V. Comments for CVE-2026-42002

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