CVE-2026-71217Iperf3: iperf3 server accepts unbounded peer-controlled json parameters enabling remote denial of service via resource exhaustion
Updated under an hour ago ()
Does this affect you?
It affects Red Hat Enterprise Linux 10. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Aug 31, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:3.17.1-6.el10_2.1 not affected | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:61257vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:61389vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:61680vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-71217vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2460984issue-tracking, x-refsource-redhat
- https://github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.