Is CVE-2026-102253 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-102253?

CVE-2026-102253 has a CVSS v3 severity of HIGH (7.5).

Back

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.