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.

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Advisories

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Fixes

Solution

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Workaround

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History

Thu, 25 Jun 2026 17:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Thu, 25 Jun 2026 15:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Thu, 25 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-115
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 25 Jun 2026 13:00:00 +0000

Type Values Removed Values Added
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.
Title EDNS options smuggling
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: OX

Published:

Updated: 2026-06-25T13:44:07.962Z

Reserved: 2026-04-23T11:15:21.198Z

Link: CVE-2026-42004

cve-icon Vulnrichment

Updated: 2026-06-25T13:43:59.267Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-25T17:00:11Z

Weaknesses