CVE-2026-42004
Low · 3.7CVSS
3.7
EPSS
0.2%
Published
Jun 25, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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