Curve25519 Blinding Vulnerability in wolfSSL by wolfSSL

CVE-2025-7396

What is CVE-2025-7396?

The recent release of wolfSSL version 5.8.2 has introduced a security feature where blinding support for Curve25519 is enabled by default in relevant builds. While designed to bolster defenses against side-channel attacks, particularly during private key extraction, this blinding technique is exclusively pertinent to the base C implementation. It is not applicable to ARM and Intel assembly builds or the small Curve25519 feature. Although executing a side-channel attack in practical scenarios is notably challenging, the incorporation of blinding provides enhanced security for environments vulnerable to physical access or observation exploits.

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References