CVE-2026-3579

MEDIUM

Non-constant time multiplication subroutine __muldi3 on RISC-V RV32I

Title source: cna

Description

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.

References (1)

Core 1

Core References

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

Scores

CVSS v3 5.9

EPSS 0.0027

EPSS Percentile 18.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-203

Status published

Products (2)

wolfssl/wolfssl 5.8.4

wolfSSL/wolfSSL < 5.9.0

Published Mar 19, 2026

Tracked Since Mar 20, 2026