CVE-2026-71217: Red Hat Enterprise Linux 10 · Improper Input Validation
Affects Red Hat Enterprise Linux 10Source CVE Database V5
Not known to be exploited · CVSS 7.5 High.
Data as of 9 Nov 2026, 23:24 UTC
Thin evidence
One scorer or none| CNA (redhat) | CVSS 3.1 | 7.5 |
|---|
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 11 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10iperf3 | Affected– | Fixed in– |
| Red Hat Enterprise Linux 8iperf3 | Affected– | Fixed in– |
| Red Hat Enterprise Linux 9iperf3 | Affected– | Fixed in– |
| Red Hat Enterprise Linux 7iperf3 | Affected– | Fixed in– |
AI-suggested
The vendor advisory recommends mitigating the issue by restricting network access to the iperf3 server to trusted clients or networks using firewall rules. If iperf3 functionality is not needed, disabling the iperf3 service is advised.
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.
References
- access.redhat.com/security/cve/CVE-2026-71217 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2460984 (opens in a new tab)
- github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61257 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61389 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:61680 (opens in a new tab)