CVE-2026-3579

wolfSSL 5.8.4 on RISC-V RV32I architectures lacks a constant-time software implementation for 64-bit multiplication. The compiler-inserted __muldi3 subroutine executes in variable time based on operand values. This affects multiple SP math functions (sp_256_mul_9, sp_256_sqr_9, etc.), leading to a timing side-channel that may expose sensitive cryptographic data.

Score

CVSS 3.1 5.9 Medium

Status

Analyzed - facts@wolfssl.com

Published

2026-03-19

Last modified

2026-03-24

Weaknesses

CWE-203

Affected products

• Wolfssl (Wolfssl)

References

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