CVE-2026-71218

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-71218
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71218.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-71218
Downstream
Published
2026-08-11T08:51:24.805Z
Modified
2026-08-13T08:06:41.059405Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
Iperf3: unbounded peer-controlled allocation in iperf3 json_read() allows unauthenticated remote memory exhaustion
Details

A flaw was found in iperf3. A remote unauthenticated attacker can exploit a vulnerability in the JSON_read() function, which accepts a peer-controlled message length and allocates memory without an upper bound. This allows the attacker to trigger excessive memory consumption, leading to a Denial of Service (DoS) through memory exhaustion, severe slowdown, or termination of the iperf3 service.

Database specific 
{
    "cwe_ids": [
        "CWE-789"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71218.json",
    "cna_assigner": "redhat"
}
References

Affected packages

Git / github.com/esnet/iperf

Affected ranges

Type
GIT
Repo
https://github.com/esnet/iperf
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0128d0357b7e8916fe39e980e455729bc0e5fd4e
Database specific
Show details 
{
    "source": "REFERENCES"
}

Affected versions

2.*
2.0-RELEASE
2.0.1-RELEASE
2.0.2-RELEASE
2.0.3-RELEASE
2.0.4-RELEASE
3.*
3.0-ALPHA1
3.0-BETA1
3.0-BETA2
3.0-BETA3
3.0-BETA4
3.0-BETA5
3.0.1
3.0.4
3.1
3.10
3.10.1
3.11
3.12
3.13
3.14
3.15
3.16
3.16-beta1
3.17.1
3.1b1
3.1b2
3.1b3
3.2
3.2rc1
3.3
3.4
3.5
3.6
3.7
3.8
3.8.1
3.9
iperf-3.*
iperf-3.0a1
Other
iperf3
trunk

Database specific

vanir_signatures_modified 
"2026-08-13T08:06:41Z"
vanir_signatures 
[
    {
        "id": "CVE-2026-71218-71e1a0f1",
        "deprecated": false,
        "signature_type": "Line",
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "304270774645485955517266248989205549676",
                "283325794397299007201438548004275922011",
                "202655944338123134059443406346973678838",
                "28143696863415599732192840274117969379",
                "262599662267697990946627437144199552407"
            ]
        },
        "source": "https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e",
        "target": {
            "file": "src/iperf_api.c"
        }
    },
    {
        "id": "CVE-2026-71218-77dbe087",
        "deprecated": false,
        "signature_type": "Function",
        "signature_version": "v1",
        "digest": {
            "length": 632.0,
            "function_hash": "171469153698128760994736031743764477921"
        },
        "source": "https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e",
        "target": {
            "function": "JSON_read",
            "file": "src/iperf_api.c"
        }
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71218.json"