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iperf3 < 3.22 UDP Receive Worker Infinite Loop DoS

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-102253

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-102253

iperf3

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://github.com/esnet/iperf",
    "vendor": "esnet",
    "product": "iperf3",
    "versions": [
      {
        "status": "affected",
        "version": "3.14",
        "lessThan": "3.22",
        "versionType": "custom"
      }
    ],
    "packageURL": "pkg:github/esnet/iperf",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-102253

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#5394 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement