What’s Vulnerable › Vulnerabilities

CVE-2026-3580: Compiler-induced timing leak in sp_256_get_entry_256_9 on RISC-V

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-19 · updated 2026-06-17
• Weakness: CWE-203

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.

Affected products

• wolfSSL: 5.8.4

References

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

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