Vulnerability in Powerdns Dnsdist

CVE-2026-40210

An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being sent over the network or a crash.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L.

EPSS exploit prediction

EPSS: 0.007 (52.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-40210: held from 0.003 to 0.007.

EPSS over last 30 days · oldest: 0.003 · newest: 0.007 · change: +0.005

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-40210?
CVE-2026-40210 is a medium-severity vulnerability in Powerdns Dnsdist, classified under Buffer Over-read. CVSS score: 4.8/10. Published 2026-06-25.
How severe is CVE-2026-40210?
Medium severity. CVSS v3 base score is 4.8 out of 10.