CVE-2026-42004
EDNS options smuggling
- State
- Published
- Severity
- 3.7 Low
- Published
- Jun 25, 2026
- Updated
- Jun 25, 2026
- Reserved
- Apr 23, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N | OX |
Weaknesses
- CWE-115 Misinterpretation of Input
Affected Products
| Product | Versions |
|---|---|
DNSdistPowerDNS |
|
References
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