CVE-2026-42004: Misinterpretation of Input in PowerDNS DNSdist
An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter.
CVE-2026-42004: Misinterpretation of Input in PowerDNS DNSdist
Description
An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter.
CVSS v3.1
Score 3.7low
Affected software
pkg:github/dnsdistRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
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: 6a3d2a1b4853345fc1f848ff
Added to database: 06/25/2026, 13:16:11 UTC
Last updated: 06/25/2026, 13:16:11 UTC
Views: 1
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