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Description

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.

PUBLISHED Reserved 2026-03-05 | Published 2026-03-19 | Updated 2026-03-19 | Assigner wolfSSL




LOW: 2.1CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

Problem types

CWE-203 Observable Discrepancy

Product status

Default status
unaffected

Any version before 5.9.0
affected

Credits

Wind Wong finder

References

github.com/wolfSSL/wolfssl/pull/9855

cve.org (CVE-2026-3580)

nvd.nist.gov (CVE-2026-3580)

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