Integer overflow in Wolfssl

CVE-2026-6678

Integer underflow in wc_PKCS7_DecryptOri when handling crafted Other Recipient Info, leading to incorrect length handling during decryption.

EPSS: 0.002 (9.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Wolfssl — versions 3.15.5

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

facts@wolfssl.com (Patch, patch, Issue Tracking)
facts@wolfssl.com (Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-6678?: CVE-2026-6678 is a medium-severity vulnerability in Wolfssl, classified under Integer Underflow. CVSS score: 5.3/10. Published 2026-06-25.
How severe is CVE-2026-6678?: Medium severity. CVSS v3 base score is 5.3 out of 10.