Off-by-one access when processing crafted UDP responses_CVE-2026-33602

6.5 / 10

MEDIUM

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

Description

A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service.

Basic Information

ID CVE-2026-33602

Source OX

Published Apr 22, 2026 at 13:45

Modified Apr 22, 2026 at 14:47

Affected Product

Vendor PowerDNS

Product DNSdist

Version 1.9.0

Affected Versions PowerDNS DNSdist 1.9.0
PowerDNS DNSdist 2.0.0

CWE Classification

CWE-122

References

www.dnsdist.org /security-advisories/powerdns-advisory-for-dnsdist-2026-04.html

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