CVE-2026-101283 Memory corruption in iperf3
Unauthenticated attackers can trigger a heap buffer overflow in iperf3 via oversized authtokens, potentially leading to code execution or service disruption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-101283?
CVE-2026-101283 is a critical memory corruption vulnerability in esnet iperf3, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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 (guard warns only), so an unauthenticated client overflows the heap via an oversized authtoken; fixed in 3.22
Weakness: CWE-122
Which versions are affected by CVE-2026-101283?
How do I fix CVE-2026-101283?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-101283 being exploited?
There is no known exploitation of CVE-2026-101283 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-101283, DEBIAN-CVE-2026-101283, GHSA-pwcx-5qh6-2pxc, UBUNTU-CVE-2026-101283.