CVE-2026-45447 is a heap use-after-free vulnerability in the PKCS7_verify() function, which is used to verify digitally signed data packages. This type of memory corruption flaw can potentially allow an attacker to execute arbitrary code or cause a crash by manipulating how memory is accessed after it has been freed. Given its presence in a cryptographic verification routine, it could undermine trust in signed content processed by affected Azure services or underlying components.

Security Architect’s Take: Review whether any Azure services or workloads you operate rely on PKCS7 signature verification and apply Microsoft’s patch immediately; in the interim, consider restricting input sources for signed data payloads and monitoring for anomalous memory-related crashes or unexpected process terminations.

Original advisory: CVE-2026-45447 Heap Use-After-Free in the PKCS7_verify() Function