CVE-2026-42002: Signal Handler Race Condition in PowerDNS Authoritative
Concurrency and locking defects in GSS-TSIG
AI Analysis
Technical Summary
This vulnerability concerns concurrency and locking defects within the GSS-TSIG implementation of PowerDNS Authoritative versions 4.9.0 and 5.0.0. Specifically, a signal handler race condition exists that can lead to a denial of service by impacting availability. The CVSS 3.1 base score is 5.9, reflecting a network attack vector with high attack complexity, no privileges required, no user interaction, and an impact limited to availability. No official remediation or patch information is currently available.
Potential Impact
The vulnerability can cause a denial of service condition due to concurrency and locking issues in the GSS-TSIG component, affecting the availability of the PowerDNS Authoritative server. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploitation in the wild has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider limiting exposure of affected PowerDNS Authoritative servers to untrusted networks and monitor for unusual service disruptions related to GSS-TSIG operations.
CVE-2026-42002: Signal Handler Race Condition in PowerDNS Authoritative
Description
Concurrency and locking defects in GSS-TSIG
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability concerns concurrency and locking defects within the GSS-TSIG implementation of PowerDNS Authoritative versions 4.9.0 and 5.0.0. Specifically, a signal handler race condition exists that can lead to a denial of service by impacting availability. The CVSS 3.1 base score is 5.9, reflecting a network attack vector with high attack complexity, no privileges required, no user interaction, and an impact limited to availability. No official remediation or patch information is currently available.
Potential Impact
The vulnerability can cause a denial of service condition due to concurrency and locking issues in the GSS-TSIG component, affecting the availability of the PowerDNS Authoritative server. There is no impact on confidentiality or integrity according to the CVSS vector. No known exploitation in the wild has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider limiting exposure of affected PowerDNS Authoritative servers to untrusted networks and monitor for unusual service disruptions related to GSS-TSIG operations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- OX
- Date Reserved
- 2026-04-23T11:15:21.198Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0edbfaba1db473627c99e9
Added to database: 5/21/2026, 10:18:34 AM
Last enriched: 5/21/2026, 10:33:59 AM
Last updated: 5/21/2026, 12:52:37 PM
Views: 6
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