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CVE-2026-71218— Iperf3: unbounded peer-controlled allocation in iperf3 json_read() allows unauthenticated remote memory exhaustion

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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存在资源管理错误漏洞，该漏洞源于JSON_read()函数接受对端控制的消息长度并无上限分配内存，可能导致未经身份验证的远程攻击者触发过度内存消耗，造成拒绝服务（内存耗尽、严重减速或服务终止）。

CVSS 5.3 · Medium EPSS 0.67% · P50

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-71218

Vulnerability Information
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Vulnerability Title
Iperf3: unbounded peer-controlled allocation in iperf3 json_read() allows unauthenticated remote memory exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
ESnet iperf 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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存在资源管理错误漏洞，该漏洞源于JSON_read()函数接受对端控制的消息长度并无上限分配内存，可能导致未经身份验证的远程攻击者触发过度内存消耗，造成拒绝服务（内存耗尽、严重减速或服务终止）。
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 Subscribe
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

II. Public POCs for CVE-2026-71218

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III. Intelligence Information for CVE-2026-71218

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Patches & Fixes for CVE-2026-71218 (1)

Vendor Advisories for CVE-2026-71218 (2)

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

CVE-2026-10579 9.8 CRITICAL Picketlink-federation: auth bypass in picketlink saml unsolicited-response
CVE-2026-19546 8.8 HIGH Dbi: incomplete fix for cve-2026-14380 dbi: arbitrary code execution via caller-influenced
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-2026-71217 7.5 HIGH Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote de
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-2026-15563 7.4 HIGH Wildfly-iiop-openjdk: missing authentication on eap's iiop nameservice leads to mitm or do
CVE-2026-15554 7.4 HIGH Undertow-core: undertow: authentication bypass via ajp ssl_cert/is_ssl forgery
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

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-789

V. Comments for CVE-2026-71218

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