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Low 3.7Published Jun 25, 2026
CVE-2026-42004EDNS options smuggling
Updated under an hour ago ()
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It affects PowerDNS DNSdist. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-115
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- OX
- NVD analysis
- Deferred
- Record last updated
- Jun 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
PowerDNS DNSdist powerdns:dnsdist (from the name) | from 1.9.0 before 1.9.15; from 2.0.0 before 2.0.7 | CNA record |
References
- https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.