What is CVE-2026-0819?

CVE-2026-0819 is a high-severity vulnerability in Wolfssl, classified under Stack-based Buffer Overflow. CVSS score: 7.1/10. Published 2026-03-19.

How severe is CVE-2026-0819?

High severity. CVSS v3 base score is 7.1 out of 10.

Buffer overflow in Wolfssl

CVE-2026-0819

A stack buffer overflow vulnerability exists in wolfSSL's PKCS7 SignedData encoding functionality. In wc_PKCS7_BuildSignedAttributes(), when adding custom signed attributes, the code passes an incorrect capacity value (esd->signedAttribsCo…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (6.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

Affected products

Wolfssl — versions 5.5.0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow
CWE-787 — Out-of-bounds Write

References

GitHub Pull Request (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-0819?: CVE-2026-0819 is a high-severity vulnerability in Wolfssl, classified under Stack-based Buffer Overflow. CVSS score: 7.1/10. Published 2026-03-19.
How severe is CVE-2026-0819?: High severity. CVSS v3 base score is 7.1 out of 10.