CVE-2026-101276
iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22.
- Published Sep 30, 2026
- CVSS 9.2 critical
- 0.4% chance of exploitation in the next 30 days (EPSS)
- A fix is available