CVE-2026-42004 – EDNS options smuggling

CVE ID :CVE-2026-42004

Published : June 25, 2026, 12:24 p.m. | 1 hour, 20 minutes ago

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.

Severity: 3.7 | LOW

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