# CVE-2026-61773: NVIDIA Megatron Bridge deserialization of untrusted data

Source: https://junglewise.ai/threats/cve-2026-61773-nvidia-megatron-bridge-deserialization-of-untrusted-data  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-01. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-61773 · Severity: high · CVSS 7.8 · Published 2026-09-01

NVIDIA Megatron Bridge is a library used for distributed training and inference of large neural networks. A deserialization vulnerability allows an attacker to execute arbitrary code, modify data, or access sensitive information if they can provide untrusted serialized input to the application.

Technologies: [Nvidia Megatron-Bridge](https://junglewise.ai/threats/technologies/megatron-bridge), [Nvidia Nemo Megatron Bridge](https://junglewise.ai/threats/technologies/nemo-megatron-bridge). Vendors: [Nvidia](https://junglewise.ai/threats/vendors/nvidia).

## Quick answers

**Is CVE-2026-61773 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-61773 being exploited in the wild.

**How severe is CVE-2026-61773?** High severity, with a CVSS score of 7.8, published 1 September 2026.

**Which products and versions are affected?** NVIDIA Megatron Bridge.

**Is there a fix for CVE-2026-61773?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-61773 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-61773?** Check whether you run Nvidia Megatron-Bridge or Nvidia Nemo Megatron Bridge. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

NVIDIA Megatron Bridge contains an insecure deserialization vulnerability (CWE-502) where the library deserializes untrusted data without proper validation. An attacker who can control serialized input—such as via network communication or file loading—can craft malicious payloads to achieve remote code execution, data tampering, or information disclosure. The vulnerability requires the affected application to pass untrusted data to the deserialization function. A fix or patch is expected from NVIDIA.

## Affected products

- NVIDIA Megatron Bridge

## Timeline

- 2026-09-01: disclosed

## References

- [https://github.com/NVIDIA/product-security/tree/main/2026/5868](https://github.com/NVIDIA/product-security/tree/main/2026/5868)
- [https://www.cve.org/CVERecord?id=CVE-2026-61773](https://www.cve.org/CVERecord?id=CVE-2026-61773)

## Related threats

- [NVIDIA Megatron Bridge deserialization vulnerability](https://junglewise.ai/threats/cve-2026-61779-nvidia-megatron-bridge-deserialization-vulnerability)
- [NVIDIA Megatron Bridge deserialization of untrusted data](https://junglewise.ai/threats/cve-2026-61778-nvidia-megatron-bridge-deserialization-of-untrusted-data)
- [NVIDIA Megatron Bridge unsafe deserialization](https://junglewise.ai/threats/cve-2026-61777-nvidia-megatron-bridge-unsafe-deserialization)
- [NVIDIA Megatron Bridge deserialization of untrusted data](https://junglewise.ai/threats/cve-2026-61776-nvidia-megatron-bridge-deserialization-of-untrusted-data)
- [NVIDIA Megatron Bridge unsafe deserialization](https://junglewise.ai/threats/cve-2026-61775-nvidia-megatron-bridge-unsafe-deserialization)