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PatchSiren cyber security CVE debrief

CVE-2026-42005 PowerDNS CVE debrief

CVE-2026-42005 is a medium-severity vulnerability in an internal web server that can cause unlimited memory allocation, leading to a denial of service. The internal web server is disabled by default. Defenders should assess exposure, prioritize verification, and consider compensating controls. This vulnerability affects product deployments with the internal web server enabled. The likely operational impact includes denial-of-service attacks. Source confidence is limited to the information provided in the CVE record and NVD entry.

Vendor
PowerDNS
Product
Authoritative
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-25
Original CVE updated
2026-10-25
Advisory published
2026-06-25
Advisory updated
2026-10-25

Who should care

Defenders and security teams should assess exposure and prioritize verification and patching or applying compensating controls. Operators of affected platforms, vulnerability management teams, and security teams should review the vulnerability details and plan for mitigations. This includes verifying if the internal web server is enabled and assessing the potential impact on their systems.

Why it matters

CVE-2026-42005 is a medium-severity vulnerability that can cause denial-of-service attacks if the internal web server is enabled. Defenders should assess exposure, prioritize verification, and consider compensating controls.

  • Denial-of-service attacks may occur if the internal web server is enabled
  • Verification of affected systems and exposure is necessary
  • Patching or applying compensating controls is recommended

Technical summary

The vulnerability causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default. This issue affects product deployments where the internal web server is enabled. Defenders should verify if their systems are affected, assess exposure, and prioritize patching or applying compensating controls.

Defensive priority

Defenders should verify if their systems are affected, assess exposure, and prioritize patching or applying compensating controls.

Recommended defensive actions

  • Verify if the internal web server is enabled and assess exposure
  • Prioritize patching or applying compensating controls
  • Monitor for potential denial-of-service attacks

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. The internal web server is disabled by default, which may reduce the attack surface.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42005 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42005

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42005 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42005

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-07.html

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.