Vulnerability DatabaseCVE-2026-42004
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CVE-2026-42004
Published:June 25, 2026
Updated:June 29, 2026
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 Packages
https://github.com/PowerDNS/pdns.git (GITHUB):
Affected version(s) >=dnsdist-1.9.0 <dnsdist-1.9.15
Fix Suggestion:
Update to version dnsdist-1.9.15
https://github.com/PowerDNS/pdns.git (GITHUB):
Affected version(s) >=dnsdist-2.0.0 <dnsdist-2.0.7
Fix Suggestion:
Update to version dnsdist-2.0.7
Related Resources (1)
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Misinterpretation of Input
CWE-115
EPSS
Base Score:
0.16