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.

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.

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.

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

security@open-xchange.com

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.