CVE-2026-33596

TCP backend stream ID overflow

State: Published
Severity: 3.1 Low
Published: Apr 22, 2026
Updated: Apr 22, 2026
Reserved: Mar 23, 2026

Description

A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend.

Scores

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

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
DNSdistPowerDNS	1.9.0 to before 1.9.13Affected 2.0.0 to before 2.0.4Affected

References

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

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