CVE-2026-3579CWE-203

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

Low · published March 19, 2026

CVSS v4.0
2.1
EPSS
0%
Percentile
19.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
2.1 · LOW
Vector
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
EPSS
0.00280 · 19.4th percentile
Weakness
CWE-203 · Observable Discrepancy
Published
2026-03-19T19:37Z
EPSS history
Timeline
  • 19 MAR 19:37Z
    Non-constant time multiplication subroutine __muldi3 on RISC-V RV32I
    cvelistv5