Vulnerability-Lookup

RHSA-2026:61680

Vulnerability from csaf_redhat - Published: 2026-08-31 16:00 - Updated: 2026-08-31 20:13

Summary

Red Hat Security Advisory: iperf3 security update

Severity

Important

Notes

Topic: An update for iperf3 is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Iperf is a tool which can measure maximum TCP bandwidth and tune various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, and data-gram loss. Security Fix(es): * iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion (CVE-2026-71217) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-71217

A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.

7.5 (High)


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

CWE-20 - Improper Input Validation

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-debuginfo-0:3.17.1-6.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-debuginfo-0:3.17.1-6.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-debuginfo-0:3.17.1-6.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-debuginfo-0:3.17.1-6.el10_2.1.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:61680	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2460984	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-71217	self
https://bugzilla.redhat.com/show_bug.cgi?id=2460984	external
https://www.cve.org/CVERecord?id=CVE-2026-71217	external
https://nvd.nist.gov/vuln/detail/CVE-2026-71217	external
https://github.com/esnet/iperf/commit/494dd377eca…	external

Acknowledgments

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          "summary": "This issue was discovered by Red Hat."
        }
      ],
      "cve": "CVE-2026-71217",
      "cwe": {
        "id": "CWE-20",
        "name": "Improper Input Validation"
      },
      "discovery_date": "2026-04-23T00:59:49+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2460984"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.aarch64",
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          "AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-71217"
        },
        {
          "category": "external",
          "summary": "RHBZ#2460984",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460984"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-71217",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-71217"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-71217",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71217"
        },
        {
          "category": "external",
          "summary": "https://github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586",
          "url": "https://github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586"
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      "release_date": "2026-08-11T08:13:48.497000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-31T16:00:41+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.s390x",
            "AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.src",
            "AppStream-10.2.Z:iperf3-0:3.17.1-6.el10_2.1.x86_64",
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            "AppStream-10.2.Z:iperf3-debuginfo-0:3.17.1-6.el10_2.1.ppc64le",
            "AppStream-10.2.Z:iperf3-debuginfo-0:3.17.1-6.el10_2.1.s390x",
            "AppStream-10.2.Z:iperf3-debuginfo-0:3.17.1-6.el10_2.1.x86_64",
            "AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.aarch64",
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            "AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:61680"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, restrict network access to the `iperf3` server to trusted clients or networks using firewall rules. If the `iperf3` server functionality is not required, disable the `iperf3` service.",
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            "AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.ppc64le",
            "AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.s390x",
            "AppStream-10.2.Z:iperf3-debugsource-0:3.17.1-6.el10_2.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion"
    }
  ]
}

CVE-2026-71217 (GCVE-0-2026-71217)

Vulnerability from cvelistv5 – Published: 2026-08-11 08:50 – Updated: 2026-08-31 16:00

Title

Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote denial of service via resource exhaustion

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 16:11 UTC

CWE

CWE-20 - Improper Input Validation

Assigner

redhat redhat root

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:61257	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:61389	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:61680	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-71217	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2460984	issue-trackingx_refsource_REDHAT
https://github.com/esnet/iperf/commit/494dd377eca…

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:3.17.1-6.el10_2.1 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:3.5-12.el8_10.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:3.9-17.el9_8.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

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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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.

Action not permitted

RHSA-2026:61680

CVE-2026-71217 (GCVE-0-2026-71217)

Tags

Sightings

Nomenclature