What is CVE-2026-5447?

CVE-2026-5447 is a high-severity vulnerability in Wolfssl, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-04-09.

How severe is CVE-2026-5447?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Wolfssl

CVE-2026-5447

Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.

Vulnerability class: Buffer Overflow

EPSS: 0.000 (10.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Wolfssl — versions 0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

facts@wolfssl.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-5447?: CVE-2026-5447 is a high-severity vulnerability in Wolfssl, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-04-09.
How severe is CVE-2026-5447?: High severity. CVSS v3 base score is 7.5 out of 10.