What is CVE-2026-3580?

CVE-2026-3580 is a medium-severity vulnerability in Wolfssl, classified under Observable Discrepancy. CVSS score: 4.7/10. Published 2026-03-19.

How severe is CVE-2026-3580?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Wolfssl

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.

EPSS: 0.001 (2.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Wolfssl — versions 5.8.4, 0

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

facts@wolfssl.com (Issue Tracking)

Frequently asked questions

What is CVE-2026-3580?: CVE-2026-3580 is a medium-severity vulnerability in Wolfssl, classified under Observable Discrepancy. CVSS score: 4.7/10. Published 2026-03-19.
How severe is CVE-2026-3580?: Medium severity. CVSS v3 base score is 4.7 out of 10.