CVE-2026-25833: Trustedfirmware Mbed TLS

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Mbed TLS 3.5.0 to 3.6.5 fixed in 3.6.6 and 4.1.0 has a buffer overflow in the x509_inet_pton_ipv6() function

Affected products

• Trustedfirmware Mbed TLS: from 3.5.0, before 3.6.6 (fixed in 3.6.6); version 4.0.0 only

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