CVE-2026-40210 PUBLISHED

Out-of-bounds read in SetMacAddrAction

Assigner: OX
Reserved: 10.04.2026 Published: 25.06.2026 Updated: 25.06.2026

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

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS Score: 4.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	PowerDNS
Product	DNSdist
Versions	Default: unaffected affected from 1.9.0 to 1.9.15 (excl.) affected from 2.0.0 to 2.0.7 (excl.)

Credits

Qifan Zhang (Palo Alto Networks) finder

References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html

Problem Types

Buffer Over-read CWE