ZDI-26-790: OpenSSL CMS AuthEnvelopedData Improper Validation of Integrity Check Value Vulnerability

This vulnerability allows network-adjacent attackers to tamper with CMS AuthEnvelopedData messages on affected installations of OpenSSL. An attacker must first obtain the ability to modify CMS AuthEnvelopedData messages in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 3.1. The following CVEs are assigned: CVE-2026-34182.