CVSS 9.2 (critical) · published 2026-09-30
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.
Weakness: CWE-416
Source: NVD CVE-2026-101276
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