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.

Mariner

Read the vendor bulletin Get alerts for azl3 python-jwt 2.13.0-1 on Azure Linux

CriticalCVSS not listedCritical severity

Scope

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azl3 python-jwt 2.13.0-1 on Azure Linux 3.0

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Timeline

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Oct 3, 2026 at 1:30 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Oct 4, 2026 at 7:15 AM UTC
Added to SecurityAlert
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Vulnerabilities

CVEs named in this advisory

CVE-2026-101276View CVSS, KEV, EPSS, and threat context

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Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-101276
Last source check: Oct 4, 2026 at 7:15 AM UTC

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What the vendor says is affected

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