CVE-2025-59438: Arm Mbed TLS

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Mbed TLS through 3.6.4 has an Observable Timing Discrepancy.

Affected products

• Arm Mbed TLS: before 3.6.5 (fixed in 3.6.5)

Published 2025-10-21. Last modified 2026-06-17.