CVE-2025-12888: wolfSSL

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Vulnerability in X25519 constant-time cryptographic implementations due to timing side channels introduced by compiler optimizations and CPU architecture limitations, specifically with the Xtensa-based ESP32 chips. If targeting Xtensa it is recommended to use the low memory implementations of X25519, which is now turned on as the default for Xtensa.

Affected products

• wolfSSL wolfSSL: version 5.8.2 only

Published 2025-11-21. Last modified 2026-06-17.