CVE-2026-3580: wolfSSL

Medium severity, CVSS 4.7. EPSS: 0.1% chance of exploitation in the next 30 days.

In wolfSSL 5.8.4, constant-time masking logic in sp_256_get_entry_256_9 is optimized into conditional branches (bnez) by GCC when targeting RISC-V RV32I with -O3. This transformation breaks the side-channel resistance of ECC scalar multiplication, potentially allowing a local attacker to recover secret keys via timing analysis.

Affected products

• wolfSSL wolfSSL: version 5.8.4 only

Published 2026-03-19. Last modified 2026-06-17.