CVE catalog

CVE-2026-71218

A flaw was found in iperf3. A remote unauthenticated attacker can exploit a vulnerability in the `JSON_read()` function, which accepts a peer-controlled message length and allocates memory without an

[CVE catalog]

Severity: Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: Aug 11, 2026, 8:13:07 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.38% · Oct 25, 2026

A flaw was found in iperf3. A remote unauthenticated attacker can exploit a vulnerability in the `JSON_read()` function, which accepts a peer-controlled message length and allocates memory without an upper bound. This allows the attacker to trigger excessive memory consumption, leading to a Denial of Service (DoS) through memory exhaustion, severe slowdown, or termination of the iperf3 service.

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`	fixed
Debian	iperf3	bookworm	`3.12-1+deb12u2`	vulnerable
Debian	iperf3	bookworm-security	`3.12-1+deb12u1`	vulnerable
Ubuntu	iperf3	pro	`3.14-1`	vulnerable
Ubuntu	iperf3	pro	`3.15-1`	vulnerable
Ubuntu	iperf3	pro	`3.16-1`	vulnerable
Ubuntu	iperf3	pro	`3.16-1build1`	vulnerable
Ubuntu	iperf3	pro	`3.16-1build2`	vulnerable
Ubuntu	iperf3	pro	`3.16-1ubuntu0.1~esm1`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	iperf3	source	sid	`3.18-1`	not yet assigned	Not reported	Not reported
Debian	iperf3	source	forky	`3.18-1`	not yet assigned	Not reported	Not reported
Debian	iperf3	source	trixie	`3.18-1`	not yet assigned	Not reported	Not reported
Debian	iperf3	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported

Notes

[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]Fixed
Details (2)
- 3.18-2+deb13u2 · amd64 · trixie
  Fixed · Fixed: 3.18-1
  nvd · iperf3 · debian · 13
- 3.18-2+deb13u2 · arm64 · trixie
  Fixed · Fixed: 3.18-1
  nvd · iperf3 · debian · 13
[libiperf0]Fixed
Source package: [iperf3]
Details (2)
- 3.18-2+deb13u2 · amd64 · trixie
  Fixed · Fixed: 3.18-1
  nvd · iperf3 · debian · 13
- 3.18-2+deb13u2 · arm64 · trixie
  Fixed · Fixed: 3.18-1
  nvd · iperf3 · debian · 13
[libiperf-dev]Fixed
Source package: [iperf3]
Details (2)
- 3.18-2+deb13u2 · amd64 · trixie
  Fixed · Fixed: 3.18-1
  nvd · iperf3 · debian · 13
- 3.18-2+deb13u2 · arm64 · trixie
  Fixed · Fixed: 3.18-1
  nvd · iperf3 · debian · 13

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

References

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