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TI-2026-49892 Aliases CVE-2026-71217GHSA-4jvc-h3x3-w6qj

Improper input validation in Red Hat Enterprise Linux 10

Priority MEDIUM 40CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 3 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00635 50th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 3 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Enterprise Linux 10—3.17.1-6.el10_2.1Patch availableCNA
Red HatRed Hat Enterprise Linux 8—3.5-12.el8_10.1Patch availableCNA
Red HatRed Hat Enterprise Linux 9—3.9-17.el9_8.1Patch availableCNA
Red HatRed Hat Enterprise Linux 7——No fix listedCNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 3.17.1-6.el10_2.1 Patch available CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 3.5-12.el8_10.1 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 3.9-17.el9_8.1 Patch available CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 4

CPEVersionsRoleVendor
cpe:/o:redhat:enterprise_linux:10.210.2—Red Hat
cpe:/a:redhat:enterprise_linux:8::appstream8—Red Hat
cpe:/a:redhat:enterprise_linux:9::appstream9—Red Hat
cpe:/o:redhat:rhel_els:77—Red Hat
  • cpe:/o:redhat:enterprise_linux:10.2 Versions 10.2 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:8::appstream Versions 8 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:9::appstream Versions 9 — ·Red Hat
  • cpe:/o:redhat:rhel_els:7 Versions 7 — ·Red Hat

Remediation

Red Hat 3 advisories

  • RHSA-2026:61680 Released 2026-08-31 · Red Hat rating Important
    iperf3 security update
    • Red Hat Enterprise Linux AppStream (v. 10) iperf3-3.17.1-6.el10_2.1
  • RHSA-2026:61389 Released 2026-08-31 · Red Hat rating Important
    iperf3 security update
    • Red Hat Enterprise Linux AppStream (v. 9) iperf3-3.9-17.el9_8.1
  • RHSA-2026:61257 Released 2026-08-31 · Red Hat rating Important
    iperf3 security update
    • Red Hat Enterprise Linux AppStream (v. 8) iperf3-3.5-12.el8_10.1

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:61680
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:61257
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:61389

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-71217
  2. 2026-10-03 Alias added: GHSA-4jvc-h3x3-w6qj
  3. 2026-10-14 EPSS moved to the below the 50th percentile
  4. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Advisory 3

Other 3

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7412 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences