CVE-2025-30193

Name	CVE-2025-30193
Description	In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.10 version. A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting. We would like to thank Renaud Allard for bringing this issue to our attention.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1106207

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
dnsdist (PTS)	bullseye	1.5.1-3	vulnerable
	bookworm	1.7.3-2	vulnerable
	trixie	1.9.10-1	fixed
	forky, sid	2.0.1-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
dnsdist	source	(unstable)	1.9.10-1			1106207

Notes

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html
https://github.com/PowerDNS/pdns/pull/15572
Fixed by: https://github.com/PowerDNS/pdns/commit/096c0fc0c015e80f815eb99aea1bc0eca28cb269 (dnsdist-1.9.10)
Fixed by: https://github.com/PowerDNS/pdns/commit/3a2a8dfdf0d9e43ba13973d31e3c6fb2da228099 (dnsdist-1.9.10)