CVE-2026-71217
Published: August 12, 2026Last modified: October 16, 2026
Description
A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | iperf3 | Fixed (3.22-r0) |
| 25 LTS | iperf3 | Unknown (3.19-r0) | |
| Stream | iperf3 | Fixed (3.22-r0) |
References
- https://access.redhat.com/errata/RHSA-2026:61257
- https://access.redhat.com/errata/RHSA-2026:61389
- https://access.redhat.com/errata/RHSA-2026:61680
- https://access.redhat.com/security/cve/CVE-2026-71217
- https://bugzilla.redhat.com/show_bug.cgi?id=2460984
- https://github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586