Type Confusion Vulnerability in OpenSSL's PKCS#7 Signature Verification

CVE-2026-22796

What is CVE-2026-22796?

A type confusion vulnerability exists in the signature verification process of PKCS#7 data in OpenSSL. This flaw occurs when the ASN1_TYPE union member is accessed without proper type validation, potentially leading to an invalid or NULL pointer dereference. This defect may allow an attacker to cause a Denial of Service by supplying a malformed signed PKCS#7 data to applications performing signature verification. As a result, invoking the problematic PKCS7_digest_from_attributes() function can lead to crashes, impacting system availability. Impact assessments indicate that this vulnerability is limited in severity due to the legacy nature of the PKCS#7 API, with a recommendation for migration to the CMS API for enhanced security.

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