CVE-2026-3580

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.

Score

CVSS 3.1 4.7 Medium

Status

Analyzed - facts@wolfssl.com

Published

2026-03-19

Last modified

2026-03-19

Weaknesses

CWE-203

Affected products

• Wolfssl (Wolfssl)

References

• https://github.com/wolfSSL/wolfssl/pull/9855