CVE-2026-71217
highA flaw was found in iperf3.
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
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (secalert@redhat.com)
Timeline (UTC)
Published: 2026-08-11 09:17
Modified: 2026-11-05 00:17
NVD status: Awaiting Analysis
Last synced 2 hours ago
Verified against the source API 2026-11-05 00:39 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://access.redhat.com/errata/RHSA-2026:61257 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:61389 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:61680 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2026-71217 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2460984 secalert@redhat.com
- https://github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586 secalert@redhat.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-05 00:39 UTC · record ↗