CriticalFix available

DEBIAN-CVE-2026-101276

Type: advisorySource: OSV1 source record

iperf3 3.21 (esnet/iperf) contains a remote, unauthenticated heap use-after-free: the server's per-test watchdog server_timer_proc() frees streams without cancelling/joining their worker threads, so a blocked worker dereferences a freed iperf_stream; fixed in 3.22.

Announced 30 Sept 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-101276

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-101276

iperf3

Source reference: /affected/0/package/name

Affected versions: 3.18-2
Source reference: /affected/0/versions
3.18-2+deb13u1
Source reference: /affected/0/versions
3.18-2+deb13u2
Source reference: /affected/0/versions
3.19.1-1
Source reference: /affected/0/versions
3.19.1-2
Source reference: /affected/0/versions
3.20-1
Source reference: /affected/0/versions
3.20-2
Source reference: /affected/0/versions
3.20-2.1
Source reference: /affected/0/versions
3.22-0.1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

iperf3

Source reference: /affected/1/package/name

Affected versions: 3.18-2
Source reference: /affected/1/versions
3.19.1-1
Source reference: /affected/1/versions
3.19.1-2
Source reference: /affected/1/versions
3.20-1
Source reference: /affected/1/versions
3.20-2
Source reference: /affected/1/versions
3.20-2.1
Source reference: /affected/1/versions
Fixed versions: 3.22-0.1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "iperf3",
      "purl": "pkg:deb/debian/iperf3?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.18-2",
      "3.18-2+deb13u1",
      "3.18-2+deb13u2",
      "3.19.1-1",
      "3.19.1-2",
      "3.20-1",
      "3.20-2",
      "3.20-2.1",
      "3.22-0.1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-101276.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.22-0.1"
          }
        ]
      }
    ],
    "package": {
      "name": "iperf3",
      "purl": "pkg:deb/debian/iperf3?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.18-2",
      "3.19.1-1",
      "3.19.1-2",
      "3.20-1",
      "3.20-2",
      "3.20-2.1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-101276.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Related CVEs: CVE-2026-101276
Source reference: /upstream

Publisher severity

critical

Source reference: /severity/0/score

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-101276 · Critical

iperf3

Event: #83866 · Revision 1
Added to Heist Feed: Mon, 26 Oct 2026 22:06:19 GMT
Publisher date: Wed, 30 Sep 2026 21:16:54 GMT

Read the original announcement

Revision history

26 Oct 2026DEBIAN-CVE-2026-101276 · Revision 1Source updated