Paper/Archive/CVE-2026-101276

CVE-2026-101276

esnet iperf3 — iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() free…

EPSS 0.4%CVSS 9.2

critical.is priorityof 100

CVSS 9.2 (CNA)9.2 / 10 × 3027.6 Not in CISA KEV+300.0 EPSS percentile 33.7.337 × 206.7 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

iperf33.21–CNA

Scores by source

Anthropic (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refnewreleases.io/project/github/esnet/iperf/release/3.22