Input Validation Flaw in Mbed TLS Affects Secure Communications

CVE-2026-34872

What is CVE-2026-34872?

An issue exists in Mbed TLS versions 3.5.x and 3.6.x through 3.6.5, along with TF-PSA-Crypto 1.0, due to improper input validation during finite-field Diffie-Hellman (FFDH) operations. This lack of contributory behavior can allow a malicious peer or an active network attacker to manipulate the shared secret, restricting it to a limited set of values. Such vulnerabilities can compromise the integrity of encryption protocols that rely on contributory key agreement, potentially leading to security breaches in affected applications.

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