Medium [CVE-2026-71218] Unbounded peer-controlled allocation in iperf3 JSON_read allows unauthenticated remote memory exhaustion
This medium-severity Red Hat Linux advisory covers CVE-2026-71218 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
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Summary
Unbounded peer-controlled allocation in iperf3 JSON_read() allows unauthenticated remote memory exhaustion. Red Hat rates this moderate (CVSS 5.3).
Weakness: CWE-789.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; and 1 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- To mitigate this issue, restrict network access to the `iperf3` control port, ensuring it is only reachable by trusted clients. This can be achieved by configuring firewall rules to limit inbound connections to the `iperf3` service. Additionally, consider running the `iperf3` service within environments that enforce process or container memory limits to further contain potential resource exhaustion. Note that authentication alone is insufficient as the memory allocation occurs before authentication checks.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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