CVE catalog

CVE-2026-71217

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Aug 11, 2026, 8:13:48 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.64% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	iperf3	sid	`3.22-0.1`	fixed
Debian	iperf3	forky	`3.22-0.1`	fixed
Debian	iperf3	trixie	`3.18-2+deb13u2`	vulnerable
Debian	iperf3	bookworm	`3.12-1+deb12u2`	vulnerable
Debian	iperf3	bookworm-security	`3.12-1+deb12u1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	iperf3	source	sid	`3.22-0.1`	not yet assigned	Not reported	[1144390]
Debian	iperf3	source	forky	`3.22-0.1`	not yet assigned	Not reported	[1144390]
Debian	iperf3	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1144390]
Debian	iperf3	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1144390]

[Debian bug #1144390]

Notes

[trixie] iperf3: Minor issue [bookworm] iperf3: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[iperf3]Affected
Details (4)
- 3.12-1+deb12u2 · amd64 · bookworm
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u2 · arm64 · bookworm
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
[libiperf0]Affected
Source package: [iperf3]
Details (4)
- 3.12-1+deb12u2 · amd64 · bookworm
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u2 · arm64 · bookworm
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
[libiperf-dev]Affected
Source package: [iperf3]
Details (4)
- 3.12-1+deb12u2 · amd64 · bookworm
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u2 · arm64 · bookworm
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12
- 3.12-1+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · iperf3 · debian · bookworm; nvd · iperf3 · debian · 12

[Debian 13 (Trixie)]

[iperf3]Affected
Details (2)
- 3.18-2+deb13u2 · amd64 · trixie
  Affected
  nvd · iperf3 · debian · 13
- 3.18-2+deb13u2 · arm64 · trixie
  Affected
  nvd · iperf3 · debian · 13
[libiperf0]Affected
Source package: [iperf3]
Details (2)
- 3.18-2+deb13u2 · amd64 · trixie
  Affected
  nvd · iperf3 · debian · 13
- 3.18-2+deb13u2 · arm64 · trixie
  Affected
  nvd · iperf3 · debian · 13
[libiperf-dev]Affected
Source package: [iperf3]
Details (2)
- 3.18-2+deb13u2 · amd64 · trixie
  Affected
  nvd · iperf3 · debian · 13
- 3.18-2+deb13u2 · arm64 · trixie
  Affected
  nvd · iperf3 · debian · 13

Observed: Oct 23, 2026, 9:42:15 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]