CVE-2026-61769 is a deserialization of untrusted data vulnerability affecting NVIDIA Megatron Bridge. An attacker who successfully exploits this vulnerability could achieve remote code execution, data tampering, and information disclosure. The vulnerability is currently undergoing analysis by NVD. NVIDIA has published a security advisory via their product-security GitHub repository. The flaw is classified as high criticality given the potential impact of code execution and data compromise. No additional technical details or proof-of-concept code are currently referenced. Users of NVIDIA Megatron Bridge should monitor NVIDIA's security advisories for patches and mitigations.