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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-71217] iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion

This high-severity Red Hat Linux advisory covers CVE-2026-71217 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-71217 Source published Source updated

VulniPulse record published Record updated

CVE-2026-71217
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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Summary

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.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-20.

Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2026:61680, RHSA-2026:61257, RHSA-2026:61389.

Affected products named by the advisory: Red Hat package: iperf3.

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 26 days ago·verify at source

Fixed versions
  • iperf3-0:3.17.1-6.el10_2.1
  • iperf3-0:3.5-12.el8_10.1
  • iperf3-0:3.9-17.el9_8.1
  • RHSA-2026:61680
  • RHSA-2026:61257
  • RHSA-2026:61389

Official advisory · high-confidence parse· fetched 26 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To mitigate this issue, restrict network access to the `iperf3` server to trusted clients or networks using firewall rules. If the `iperf3` server functionality is not required, disable the `iperf3` service.

Official advisory · high-confidence parse· fetched 26 days ago·verify at source

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