Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-4159

1-byte OOB heap read in wc_PKCS7_DecodeEnvelopedData via zero-length encrypted content. A vulnerability existed in wolfSSL 5.8.4 and earlier, where a 1-byte out-of-bounds heap read in wc_PKCS7_DecodeEnvelopedData could be triggered by a crafted CMS EnvelopedData message with zero-length encrypted content. Note that PKCS7 support is disabled by default.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.5%
CVSS Severity
CVSS v3 Score 3.3
Products affected by CVE-2026-4159


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