CVE-2026-33596 — TCP backend stream ID overflow

CVE-2026-33596

TCP backend stream ID overflow PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
PowerDNS / DNSdist	affected 1.9.0 before 1.9.13; affected 2.0.0 before 2.0.4

CWE

No CWE identifiers supplied.

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.