CVE-2026-34875: Trustedfirmware Mbed TLS

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

An issue was discovered in Mbed TLS through 3.6.5 and TF-PSA-Crypto 1.0.0. A buffer overflow can occur in public key export for FFDH keys.

Affected products

• Trustedfirmware Mbed TLS: from 3.5.0, before 3.6.6 (fixed in 3.6.6)
• Trustedfirmware Tf-Psa-Crypto: before 1.1.0 (fixed in 1.1.0)

Published 2026-04-01. Last modified 2026-06-17.