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CVE-2026-71217— Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote denial of service via resource exhaustion

Quick assessment

Affected

Red Hat Red Hat Enterprise Linux 10

Exploitation

Public or AI PoC available; prioritize validation

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ESnet iperf是ESnet组织的一款用于主动测量 IP 网络最大可达带宽的工具。 ESnet iperf存在输入验证错误漏洞，该漏洞源于对控制通道JSON中的超大数值参数（如parallel和len）未正确验证，可能导致过多的流和线程创建以及大缓冲区分配，造成资源耗尽，从而导致拒绝服务。

CVSS 7.5 · High EPSS 0.82% · P56 Updated Sep 01, 2026

In-the-Wild Activity Observed github_trending · low

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

Vendor	Product	Version Range	Status
Red Hat	Red Hat Enterprise Linux 10	`0:3.17.1-6.el10_2.1< *`	unaffected
Red Hat	Red Hat Enterprise Linux 7	`any`	affected
Red Hat	Red Hat Enterprise Linux 8	`0:3.5-12.el8_10.1< *`	unaffected
Red Hat	Red Hat Enterprise Linux 9	`0:3.9-17.el9_8.1< *`	unaffected

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I. Basic Information for CVE-2026-71217

Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

输入验证不恰当

Source: CVE Program / CVE List V5

Vulnerability Title

ESnet iperf 输入验证错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat Enterprise Linux 10	0:3.17.1-6.el10_2.1 ~ *	`cpe:/o:redhat:enterprise_linux:10.2`
Red Hat	Red Hat Enterprise Linux 8	0:3.5-12.el8_10.1 ~ *	`cpe:/a:redhat:enterprise_linux:8::appstream`
Red Hat	Red Hat Enterprise Linux 9	0:3.9-17.el9_8.1 ~ *	`cpe:/a:redhat:enterprise_linux:9::appstream`
Red Hat	Red Hat Enterprise Linux 7	-	`cpe:/o:redhat:enterprise_linux:7`

II. Public POCs for CVE-2026-71217

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-71217

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Patches & Fixes for CVE-2026-71217 (1)

🔗 Add JSON value checks for get_parameters. (#2039) · esnet/iperf@494dd37 · GitHub Read full article

Vendor Advisories for CVE-2026-71217 (5)

🔗 CVE-2026-71217 - Red Hat Customer Portal vdb-entry x_refsource_REDHAT
🔗 2460984 – (CVE-2026-71217) CVE-2026-71217 iperf3: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial of service via resource exhaustion Read full article issue-tracking x_refsource_REDHAT
🔗 RHSA-2026:61389 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:61257 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT
🔗 RHSA-2026:61680 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT

https://www.cve.org/CVERecord?id=CVE-2026-71217

Same Patch Batch · Red Hat · 2026-08-11 · 29 CVEs total

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CVE-2026-15555	8.8 HIGH	Jboss-marshalling-river: wildfly-clustering-infinispan-marshalling: jboss deserialization
CVE-2026-19550	8.2 HIGH	Freeipa: ipa: freeipa: trust-fetch-domains uses trust-read aci to gate a privileged ad tru
CVE-2026-15556	8.1 HIGH	Picketlink-federation: picketlink saml 2.0 auth bypass via missing assertions
CVE-2026-15560	8.1 HIGH	Openjdk-orb: unauthed class loading via iiop in eap
CVE-2026-72693	7.8 HIGH	Kbd: local privilege escalation in openvt via incorrect process owner verification allowin
CVE-2026-15565	7.5 HIGH	Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serveren
CVE-2026-71467	7.5 HIGH	Acm-search-v2-api-rhel9: search-v2-api: authentication bypass on /federated via upgrade: w
CVE-2026-15567	7.5 HIGH	Wildfly: wildfly-iiop: wildfly-jacorb: wildfly: pre-auth denial of service on the iiop lis
CVE-2026-15562	7.5 HIGH	Jboss-remoting: jboss-remoting: integer overflow in messagereader leads to pre-authenticat
CVE-2026-15561	7.5 HIGH	Undertow-core: oom via missing limits in chunked trailer in eap's undertow
CVE-2026-15554	7.4 HIGH	Undertow-core: undertow: authentication bypass via ajp ssl_cert/is_ssl forgery
CVE-2026-15563	7.4 HIGH	Wildfly-iiop-openjdk: missing authentication on eap's iiop nameservice leads to mitm or do
CVE-2026-50237	7.4 HIGH	Openshift/console: namespace tenant ssrf with egress bypass, catalog poisoning, and admin-
CVE-2026-50236	7.4 HIGH	Openshift/console: authenticated ssrf with full response reflection and path neutralizatio
CVE-2026-72694	7.1 HIGH	Mrtg: mrtg daemon symlink-following chown allows local privilege escalation via pid file p
CVE-2026-71474	7.1 HIGH	Insights-client-rhel9: insights-client: pull-secret bearer token written to logs on non-20
CVE-2026-71475	6.8 MEDIUM	Insights-client-rhel9: insights-client: spoke-controlled clusterid injected unencoded into
CVE-2026-24330	6.5 MEDIUM	Wildfly-core: wildfly: arbitrary file read via malicious archive deployment

Showing top 20 of 29 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10

Same vendor: Red Hat

Same weakness: CWE-20

V. Comments for CVE-2026-71217

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-71217— Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote denial of service via resource exhaustion

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 4

I. Basic Information for CVE-2026-71217

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-71217

III. Intelligence Information for CVE-2026-71217

Patches & Fixes for CVE-2026-71217 (1)

Vendor Advisories for CVE-2026-71217 (5)

Same Patch Batch · Red Hat · 2026-08-11 · 29 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-71217

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