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CVE-2026-42004

EDNS options smuggling

Published: Jun 25, 2026Updated: Jun 25, 2026 Sources: CVE List NVDCWE-115
3.7LOW
NVD MITRE
EPSS Score
0.2%
Top 94.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-115

Affected Products

PowerDNS
oss-project·DKaka powerdns recursor, powerdns authoritative, dnsdist
DNSdistOn-prem
Networking Infrastructure / dns-dhcp-ntp

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

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

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