CVE-2026-71218
Publication date 13 August 2026
Last updated 14 August 2026
Ubuntu priority
Description
A flaw was found in iperf3. A remote unauthenticated attacker can exploit a vulnerability in the `JSON_read()` function, which accepts a peer-controlled message length and allocates memory without an upper bound. This allows the attacker to trigger excessive memory consumption, leading to a Denial of Service (DoS) through memory exhaustion, severe slowdown, or termination of the iperf3 service.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| iperf3 | 26.04 LTS resolute |
Not affected
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score
5.3 · Medium
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-71218
- https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e (3.18)
- https://bugzilla.redhat.com/show_bug.cgi?id=2463003
- https://access.redhat.com/security/cve/CVE-2026-71218
- https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e