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.

An update of the iperf package has been released.

The remote SUSE Linux SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4678-1 advisory.

    - CVE-2026-71217: iperf3 server accepts unbounded peer-controlled JSON parameters enabling remote denial     of service via       resource exhaustion (bsc#1284405).
    - CVE-2026-71218: unbounded peer-controlled allocation in JSON_read() allows unauthenticated remote memory     exhaustion       (bsc#1284404).
    - CVE-2026-101276: 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     (bsc#1283786).
    - CVE-2026-101283: iperf3 3.20--3.21 (esnet/iperf) has a pre-auth heap buffer overflow in     decrypt_rsa_message(): a       256-byte RSA buffer is BIO_read with the attacker-controlled ciphertext length (bsc#1283787).
    - CVE-2026-102253: missing checks in the server's UDP receive worker allows unauthenticated remote     attackers to cause an       infinite loop (bsc#1283528).

    Changes for iperf:

    - Updated to version 3.22.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-101276)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
375118	Photon OS 5.0: Iperf PHSA-2026-5.0-92-1024	Nessus	PhotonOS Local Security Checks	Local	critical
375040	Photon OS 4.0: Iperf PHSA-2026-4.0-1083	Nessus	PhotonOS Local Security Checks	Local	critical
366401	SUSE SLES15 Security Update : iperf (SUSE-SU-2026:4678-1)	Nessus	SuSE Local Security Checks	Local	critical
358359	Linux Distros Unpatched Vulnerability : CVE-2026-101276	Nessus	Misc.	Local	critical

Detections

Analytics

CVE-2026-101276

critical

Tenable Plugins

critical

critical

critical

critical