CVE-2026-102253

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.

Database specific

{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-835"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102253.json"
}

References

Affected packages

Git / github.com/esnet/iperf

Affected ranges

Type

GIT

Repo

https://github.com/esnet/iperf

Events

Introduced

a0be85934144bc04712a6695b14ea6e45c379e1d

Fixed

926bd905501b792bd082d2200d1d1a84aa543e3a

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "3.14"
                },
                {
                    "fixed":  "3.22"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "original_tag":  "3.22",
            "range":  [
                {
                    "fixed":  "926bd905501b792bd082d2200d1d1a84aa543e3a"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "3.22"
                }
            ],
            "source":  "DESCRIPTION"
        }
    ]
}

Affected versions

3.*

3.14

3.15

3.16

3.16-beta1

3.17.1

3.18

3.19

3.20

3.21

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102253.json"