CVE-2026-101276

CriticalCVSS 9.2/10Last modified Oct 1, 2026

Description

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.

Metrics

CVSS 4.0 9.2/10

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weakness enumeration

CWE-416

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
esnet	iperf3	3.21

References

https://newreleases.io/project/github/esnet/iperf/release/3.22

Timeline

Published: Sep 30, 2026
Last modified: Oct 1, 2026
NVD status: Awaiting Analysis

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