CVE-2026-42004
3.7
LOW
CVSS 3.1
EPSS 0.16%
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.
How to fix CVE-2026-42004
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- Debian/dnsdist—no fix listed
Is CVE-2026-42004 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |