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CVE-2026-42004

EDNS options smuggling

LOW
3.7
CVSS Score
Published: June 25, 2026 at 12:24 PM UTC
Updated: October 25, 2026 at 11:10 PM UTC
2 products affected across 1 vendorDNSdistAuthoritative

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Severity
LOW3.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

DNSdist· Powerdns
90%
1.9.0 ≤ v < 1.9.152.0.0 ≤ v < 2.0.71.9.02.0.0
Affected range stops below 1.9.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.7, so it looks safe — our inference, not a vendor statement
Authoritative· Powerdns
85%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

3.7LOWOX
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-115

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