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CVE-2026-101276

iperf3 · Vulnerability

CVSS 4.0 9.2 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-101276

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-101276

Published

iperf3

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "esnet",
                    "product": "iperf3",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "3.21"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON