CVE-2026-64812 is a critical vulnerability affecting JetBrains IntelliJ IDEA versions prior to 2026.2. The flaw stems from improper validation of user input during Remote Development sessions, permitting unauthorized actors to inject malicious data and execute arbitrary code with the privileges of the affected process. This vulnerability carries a CVSS score of 10.0, reflecting its severity and potential for remote code execution without requiring user interaction. All users of impacted versions are advised to apply the vendor-released patch immediately. Attackers could exploit this issue to compromise systems, escalate privileges, or exfiltrate sensitive data. Mitigation includes updating to IntelliJ IDEA 2026.2 or later, restricting network access to development environments, and monitoring for anomalous activity in Remote Development workflows. Organizations are urged to prioritize remediation due to the high exploitability and potential for widespread impact.