CVE-2026-101276 json
iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees…
published 2026-09-30 39 d ago modified 2026-10-01 38 d ago also EUVD-2026-90387
- cvss
- 9.2
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- iperf3 Debian 14 3.22-0.1
debian advisories DEBIAN-CVE-2026-101276
- iperf SLE Module for Package Hub 15 SP7, Enterprise Storage 7.1 3.22-150000.3.18.1
- iperf SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 3.21-160000.1.1
suse advisories SUSE-SU-2026:4678-1SUSE-SU-2026:24178-1SUSE-SU-2026:24234-1
- iperf openSUSE Leap 16.0 3.21-160000.1.1
- iperf openSUSE Tumbleweed 3.22-1.1
opensuse advisories openSUSE-SU-2026:22090-1openSUSE-SU-2026:12060-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 38 d ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.2 | 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 |
| CNA | 4.0 | 9.2 | 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 |
Affected products
- esnet iperf3
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
newreleases.io
/project/github/esnet/iperf/release/3.22
release-notes
Sources
- CVE List CVE-2026-101276
- NVD CVE-2026-101276
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.