CVE-2026-42004
EDNS options smuggling
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | powerdns |
| Product | dnsdist |
| Published | Jun 25, 2026 |
| Last Updated | Jun 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
PowerDNS / DNSdist
1.9.0 < 1.9.15 2.0.0 < 2.0.7
References
Credits
Vitaly Simonovich