What is CVE-2026-5393?

CVE-2026-5393 is a critical-severity vulnerability in Wolfssl, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2026-04-10.

How severe is CVE-2026-5393?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Out-of-bounds Read in Wolfssl

CVE-2026-5393

Dual-Algorithm CertificateVerify out-of-bounds read. When processing a dual-algorithm CertificateVerify message, an out-of-bounds read can occur on crafted input. This can only occur when --enable-experimental and --enable-dual-alg-certs i…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (16.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Wolfssl — versions 0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

facts@wolfssl.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-5393?: CVE-2026-5393 is a critical-severity vulnerability in Wolfssl, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2026-04-10.
How severe is CVE-2026-5393?: Critical severity. CVSS v3 base score is 9.1 out of 10.