CVE-2026-81990 is a Use After Free vulnerability in Adobe Acrobat Reader. This flaw allows an attacker to execute arbitrary code in the context of the current user if the victim opens a crafted malicious file. The vulnerability requires user interaction and is classified under CWE-416. The CVSS v3.1 base score is 7.8, indicating high severity with attack vector local, low attack complexity, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability.

Successful exploitation can lead to arbitrary code execution with the current user's privileges, potentially compromising confidentiality, integrity, and availability of the affected system. However, exploitation requires the victim to open a malicious file, limiting the attack vector to user interaction.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should avoid opening files from untrusted sources and apply any recommended security best practices from Adobe.