Denial of Service Vulnerability in iperf3 by Red Hat
CVE-2026-71217

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Vendor
CVE Published:
11 August 2026

What is CVE-2026-71217?

A vulnerability exists in iperf3 that allows remote attackers to exploit flawed input validation of control-channel JSON data. By submitting oversized numeric parameters such as 'parallel' and 'len', an attacker can provoke the server into creating excessive streams and threads, leading to large buffer allocations. This condition can deplete system resources, which ultimately may render the iperf3 server inoperable, resulting in a Denial of Service.

References

https://access.redhat.com/security/cve/CVE-2026-71217
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2460984
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Found by AISLE in partnership with Red Hat.
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