Vulnerability-Lookup

CVE-2026-71218 (GCVE-0-2026-71218)

Vulnerability from cvelistv5 – Published: 2026-08-11 08:51 – Updated: 2026-08-11 13:00

Title

Iperf3: unbounded peer-controlled allocation in iperf3 json_read() allows unauthenticated remote memory exhaustion

Summary

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.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 12:54 UTC

CWE

CWE-789 - Memory Allocation with Excessive Size Value

Assigner

redhat redhat root

References

3 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-71218	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2463003	issue-trackingx_refsource_REDHAT
https://github.com/esnet/iperf/commit/0128d0357b7…

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-08-11 08:13

Credits

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

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-71218

Vulnerability from fkie_nvd - Published: 2026-08-11 09:17 - Updated: 2026-08-14 19:07

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-71218
	secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2463003
	secalert@redhat.com	https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-8M2W-V7G5-76V3

Vulnerability from github – Published: 2026-08-11 09:32 – Updated: 2026-08-11 12:30

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.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Show details on source website

JSON

To clipboard

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    "severity": "MODERATE"
  },
  "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.",
  "id": "GHSA-8m2w-v7g5-76v3",
  "modified": "2026-08-11T12:30:22Z",
  "published": "2026-08-11T09:32:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71218"
    },
    {
      "type": "WEB",
      "url": "https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-71218"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463003"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-71218

Vulnerability from csaf_microsoft - Published: 2026-08-14 19:01 - Updated: 2026-08-23 14:56

Summary

Iperf3: unbounded peer-controlled allocation in iperf3 json_read() allows unauthenticated remote memory exhaustion

Scope

1 vulnerability in this advisory, including CVE-2026-71218.

CVE-2026-71218

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 1 product Known affected: 1 product

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

ubuntu-cve-2026-71218

Vulnerability from osv_ubuntu

Published

2026-08-11 09:17

Modified

2026-08-19 11:09

Summary

Details

Severity

5.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-71218	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-71218	REPORT
	https://github.com/esnet/iperf/commit/0128d0357b7…	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2463003	REPORT
	https://access.redhat.com/security/cve/CVE-2026-71218	REPORT
	https://github.com/esnet/iperf/commit/0128d0357b7…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "iperf3",
            "binary_version": "3.0.11-1ubuntu0.1~esm2"
          },
          {
            "binary_name": "libiperf0",
            "binary_version": "3.0.11-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "iperf3",
        "purl": "pkg:deb/ubuntu/iperf3@3.0.11-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.11-1",
        "3.0.11-1ubuntu0.1~esm1",
        "3.0.11-1ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "iperf3",
            "binary_version": "3.1.3-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libiperf0",
            "binary_version": "3.1.3-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "iperf3",
        "purl": "pkg:deb/ubuntu/iperf3@3.1.3-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.3-1",
        "3.1.3-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "iperf3",
            "binary_version": "3.7-3ubuntu0.1~esm2"
          },
          {
            "binary_name": "libiperf0",
            "binary_version": "3.7-3ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "iperf3",
        "purl": "pkg:deb/ubuntu/iperf3@3.7-3ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.6-2",
        "3.7-1",
        "3.7-2",
        "3.7-3",
        "3.7-3ubuntu0.1~esm1",
        "3.7-3ubuntu0.1~esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "iperf3",
            "binary_version": "3.9-1+deb11u1ubuntu0.1"
          },
          {
            "binary_name": "libiperf0",
            "binary_version": "3.9-1+deb11u1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "iperf3",
        "purl": "pkg:deb/ubuntu/iperf3@3.9-1+deb11u1ubuntu0.1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.9-1",
        "3.9-1build1",
        "3.9-1+deb11u1build0.22.04.1",
        "3.9-1+deb11u1ubuntu0.1~esm1",
        "3.9-1+deb11u1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "iperf3",
            "binary_version": "3.16-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libiperf0",
            "binary_version": "3.16-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "iperf3",
        "purl": "pkg:deb/ubuntu/iperf3@3.16-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.14-1",
        "3.15-1",
        "3.16-1",
        "3.16-1build1",
        "3.16-1build2",
        "3.16-1ubuntu0.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "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.",
  "id": "UBUNTU-CVE-2026-71218",
  "modified": "2026-08-19T11:09:40Z",
  "published": "2026-08-11T09:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-71218"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-71218"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463003"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-71218"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/esnet/iperf/commit/0128d0357b7e8916fe39e980e455729bc0e5fd4e"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-71218"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-71218 (GCVE-0-2026-71218)

FKIE_CVE-2026-71218

GHSA-8M2W-V7G5-76V3

MSRC_CVE-2026-71218

ubuntu-cve-2026-71218

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour