CVE-2026-3579

LOW

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 v4 2.1

EPSS 0.0027

EPSS Percentile 17.6%

CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-203

Status published

Products (1)

wolfSSL/wolfSSL < 5.9.0

Published Mar 19, 2026

Tracked Since Mar 20, 2026