What is CVE-2026-2646?

CVE-2026-2646 is a high-severity vulnerability in Wolfssl, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-03-19.

How severe is CVE-2026-2646?

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

Buffer overflow in Wolfssl

CVE-2026-2646

A heap-buffer-overflow vulnerability exists in wolfSSL's wolfSSL_d2i_SSL_SESSION() function. When deserializing session data with SESSION_CERTS enabled, certificate and session id lengths are read from an untrusted input without bounds val…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (12.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

Wolfssl — versions 0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow
CWE-787 — Out-of-bounds Write

References

facts@wolfssl.com (Patch, Issue Tracking)
facts@wolfssl.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-2646?: CVE-2026-2646 is a high-severity vulnerability in Wolfssl, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-03-19.
How severe is CVE-2026-2646?: High severity. CVSS v3 base score is 8.1 out of 10.