| Name | CVE-2026-101276 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1149699 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| iperf3 (PTS) | bookworm | 3.12-1+deb12u2 | fixed |
| bookworm (security) | 3.12-1+deb12u1 | fixed |
| trixie | 3.18-2+deb13u2 | vulnerable |
| forky, sid | 3.22-0.1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| iperf3 | source | bookworm | (not affected) | | | |
| iperf3 | source | (unstable) | 3.22-0.1 | | | 1149699 |
Notes
[trixie] - iperf3 <no-dsa> (Minor issue)
[bookworm] - iperf3 <not-affected> (Use-after-free needs worker threads, introduced in 3.16)
https://github.com/esnet/iperf/releases/tag/3.22
https://github.com/esnet/iperf/commit/9bea2d9a49d54870e2405c209fa60bf134a8a1a1 (3.22)