CVE-2026-76408 is a critical vulnerability identified by Cisco during an internal security review. It involves improper control of a resource through its lifetime, classified under CWE-664. The vulnerability has a high CVSS score of 9.8, indicating severe impact on confidentiality, integrity, and availability. Cisco released a software hardening update addressing multiple internally discovered vulnerabilities, including this one. No specific affected versions or exploit activity in the wild have been reported.