CVE-2026-101276

critical · 9.2

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.

9.2

CVSS

0.4%

EPSS (exploit prob.)

35th

EPSS percentile

2026-09-30

Published

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

Weaknesses

CWE-416

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-101276