What is CVE-2026-5188?

CVE-2026-5188 is a high-severity vulnerability in Wolfssl, classified under Integer Underflow. CVSS score: 8.1/10. Published 2026-04-10.

How severe is CVE-2026-5188?

High severity. CVSS v3 base score is 8.1 out of 10.

Integer overflow in Wolfssl

CVE-2026-5188

An integer underflow issue exists in wolfSSL when parsing the Subject Alternative Name (SAN) extension of X.509 certificates. A malformed certificate can specify an entry length larger than the enclosing sequence, causing the internal leng…

EPSS: 0.000 (11.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

Affected products

Wolfssl — versions 0

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

facts@wolfssl.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-5188?: CVE-2026-5188 is a high-severity vulnerability in Wolfssl, classified under Integer Underflow. CVSS score: 8.1/10. Published 2026-04-10.
How severe is CVE-2026-5188?: High severity. CVSS v3 base score is 8.1 out of 10.