CVE-2026-6681: wolfSSL

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.

Affected products

• wolfSSL wolfSSL: from 3.10.0, before 5.9.1 (fixed in 5.9.1)

Published 2026-06-25. Last modified 2026-06-27.