DEBIAN-CVE-2026-101276: iperf3 security update

DEBIAN-CVE-2026-101276, released October 5, 2026, fixes 1 CVE in iperf3 (version 3.22-0.1). None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

n/a

No CVSS score published

Highest EPSS

0.0040

34th percentile

Fixed package versions

Product	Release	Fixed in
iperf3	Debian 14	3.22-0.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-101276	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.	n/a	0.0040	None reported

Also fixes CVE-2026-101276

OPENSUSE-SU-2026:22090-1
iperf on opensuse-leap 16.0
SUSE-SU-2026:24234-1
iperf on sles 16.0
SUSE-SU-2026:4678-1
iperf on sles 15.7

Vendor advisory

https://security-tracker.debian.org/tracker/CVE-2026-101276

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