CVE-2026-4159
Low
Description
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.
SeverityLow
CVSS3.3
Exploit probability—
ProductWolfssl
PublishedMar 19, 2026
First seenMar 19, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- wolfssl wolfssl5.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wolfssl wolfssl | v < 5.9.0 | 5.9.0 |
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