Improper input validation in Red Hat Enterprise Linux 10
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.008 · change: +0.004
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/security/cve/CVE-2026-71217 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586
- access.redhat.com/errata/RHSA-2026:61257 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:61389 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:61680 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-71217?
- CVE-2026-71217 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-08-11.
- How severe is CVE-2026-71217?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2026-71217 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.