Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-71217: 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.
Fixed packages 4
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | iperf3 | 0:3.19.1-1.amzn2023.0.1 |
| Amazon Linux · 2023 | iperf3-debuginfo | 0:3.19.1-1.amzn2023.0.1 |
| Amazon Linux · 2023 | iperf3-debugsource | 0:3.19.1-1.amzn2023.0.1 |
| Amazon Linux · 2023 | iperf3-devel | 0:3.19.1-1.amzn2023.0.1 |
Vulnerabilities 1
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High 7.5CVE-2026-71217 Public exploit
Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote denial of service via resource exhaustion
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 validatio…
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-71217.html