Iperf3: unbounded peer-controlled allocation in iperf3 json_read() allows unauthenticated remote memory exhaustion
CVE-2026-71218 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-71218, released August 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| iperf · opensuse-leap 16.0 | 3.21-160000.1.1 | OPENSUSE-SU-2026:22090-1 | Nov 7, 2026 |
| iperf · sles 15.7 | 3.22-150000.3.18.1 | SUSE-SU-2026:4678-1 | Nov 7, 2026 |
| iperf · sles 16.0 | 3.21-160000.1.1 | SUSE-SU-2026:24234-1 | Nov 7, 2026 |
| iperf3 · Debian 13.5 (trixie) | 3.18-1 | DEBIAN-CVE-2026-71218 | Aug 13, 2026 |
| iperf3 · Debian 14 | 3.18-1 | DEBIAN-CVE-2026-71218 | Aug 13, 2026 |
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