CVE-2026-5392: wolfSSL

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Heap out-of-bounds read in PKCS7 parsing. A crafted PKCS7 message can trigger an OOB read on the heap. The missing bounds check is in the indefinite-length end-of-content verification loop in PKCS7_VerifySignedData().

Affected products

• wolfSSL wolfSSL: before 5.9.1 (fixed in 5.9.1)

Published 2026-04-10. Last modified 2026-06-17.