VULNERABILITY INTELLIGENCE

CVE-2026-42004

CVSS score3.7 LOW
EPSS probability0.22%
CISA KEVNot currently listed
Published2026-06-25
Last modified2026-06-25
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Weakness classification

  • CWE-115: Misinterpretation of Input

Primary references