Loop with Unreachable Exit Condition ('Infinite Loop') Affecting iperf3 package, versions *


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.43% (35th percentile)

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  • Snyk IDSNYK-ECHOLATEST-IPERF3-20360702
  • published1 Oct 2026
  • disclosed29 Sept 2026

Introduced: 29 Sep 2026

NewCVE-2026-102253  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest iperf3.

NVD Description

Note: Versions mentioned in the description apply only to the upstream iperf3 package and not the iperf3 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.

CVSS Base Scores

version 3.1