PT-2026-31864 · Wolfssl · Wolfssl

Published 2026-04-10 · Updated 2026-04-10 · CVE-2026-5500

Mitre

CVSS v4.0

8.7

High

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

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.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-5500

Affected Products

Wolfssl

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-5500 · Security Note
• https://github.com/wolfSSL/wolfssl/pull/10102 · Note