Bug 2544371 (CVE-2026-101283)

Summary: CVE-2026-101283 iperf3: iperf3: pre-auth heap buffer overflow in decrypt_rsa_message()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in iperf3. When configured with RSA authentication, the application fails to properly validate the length of incoming encrypted authentication messages before copying them into a fixed-size memory buffer. An unauthenticated remote attacker can exploit this vulnerability by sending an oversized authentication token, triggering a heap-based buffer overflow. This vulnerability could allow an attacker to execute arbitrary code or crash the application, resulting in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-30 21:41:16 UTC
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