Improper input validation in Wolfssl
CVE-2026-5500
wolfSSL's wc_PKCS7_DecodeAuthEnvelopedData() does not properly sanitize the AES-GCM authentication tag length received and has no lower bounds check. A man-in-the-middle can therefore truncate the mac field from 16 bytes to 1 byte, reducing the tag check from 2⁻¹²⁸ to 2⁻⁸.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.004 (28.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Wolfssl — versions 0
Weakness classification (CWE)
References
- facts@wolfssl.com (Issue Tracking)
Frequently asked questions
- What is CVE-2026-5500?
- CVE-2026-5500 is a medium-severity vulnerability in Wolfssl, classified under Improper Input Validation. CVSS score: 5.9/10. Published 2026-04-10.
- How severe is CVE-2026-5500?
- Medium severity. CVSS v3 base score is 5.9 out of 10.