CVE catalog

CVE-2026-102253

iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop

[CVE catalog]

Severity: High · CVSS 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Sep 29, 2026, 8:11:47 PM UTC
Updated: Sep 29, 2026, 9:17:13 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.43% · Oct 25, 2026

iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.

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`	not affected
Debian	iperf3	bookworm-security	`3.12-1+deb12u1`	not affected

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	[1149699]
Debian	iperf3	source	forky	`3.22-0.1`	not yet assigned	Not reported	[1149699]
Debian	iperf3	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1149699]
Debian	iperf3	source	bookworm	`Not affected`	unimportant	Not reported	[1149699]

[Debian bug #1149699]

Notes

[trixie] iperf3: Minor issue

OpenFactory catalog packages

[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

[Debian 12 (Bookworm)]

[iperf3]Not affected
Details (4)
- 3.12-1+deb12u2 · amd64 · bookworm
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u2 · arm64 · bookworm
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · iperf3 · debian · bookworm
[libiperf0]Not affected
Source package: [iperf3]
Details (4)
- 3.12-1+deb12u2 · amd64 · bookworm
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u2 · arm64 · bookworm
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · iperf3 · debian · bookworm
[libiperf-dev]Not affected
Source package: [iperf3]
Details (4)
- 3.12-1+deb12u2 · amd64 · bookworm
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u2 · arm64 · bookworm
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · iperf3 · debian · bookworm
- 3.12-1+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · iperf3 · debian · bookworm

Observed: Oct 23, 2026, 7:47:19 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]