CVE-2026-102253

Name	CVE-2026-102253
Description	iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
iperf3 (PTS)	bookworm	3.12-1+deb12u2	vulnerable
	bookworm (security)	3.12-1+deb12u1	vulnerable
	trixie	3.18-2+deb13u2	vulnerable
	forky, sid	3.20-2.1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
iperf3	source	(unstable)	(unfixed)

https://github.com/esnet/iperf/commit/a25378f8cbbaa7b3db5674ca3dcc19658ae65da3 (3.22)
https://github.com/esnet/iperf/releases/tag/3.22