Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:61257
- https://access.redhat.com/errata/RHSA-2026:61389
- https://access.redhat.com/errata/RHSA-2026:61680
- https://access.redhat.com/security/cve/CVE-2026-71217
- https://bugzilla.redhat.com/show_bug.cgi?id=2460984
- https://github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586
FAQ
What is CVE-2026-71217?
CVE-2026-71217 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 prop...
How severe is CVE-2026-71217?
CVE-2026-71217 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-71217?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.