CVE-2026-5500

MediumCVSS 5.9/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 5.9/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-20

Affected software

VendorProductVersions
wolfSSLwolfSSL<= 5.9.0

References

Timeline

Published
Apr 10, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2026-5500: Medium severity, CVSS 5.9 | Vulnix