CVE-2026-71217: Red Hat Enterprise Linux 10

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Red Hat Red Hat Enterprise Linux 10: before 0:3.17.1-6.el10_2.1 (fixed in 0:3.17.1-6.el10_2.1)
• Red Hat Red Hat Enterprise Linux 7
• Red Hat Red Hat Enterprise Linux 8: before 0:3.5-12.el8_10.1 (fixed in 0:3.5-12.el8_10.1)
• Red Hat Red Hat Enterprise Linux 9: before 0:3.9-17.el9_8.1 (fixed in 0:3.9-17.el9_8.1)

Published 2026-08-11. Last modified 2026-08-31.