# CVE-2026-61770: NVIDIA Megatron Bridge unsafe deserialization

Source: https://junglewise.ai/threats/cve-2026-61770-nvidia-megatron-bridge-unsafe-deserialization  
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-2026-61770 · Severity: high · CVSS 7.8 · Published 2026-09-01

NVIDIA Megatron Bridge is a distributed computing framework used to train large language models. A deserialization vulnerability allows attackers to execute arbitrary code, modify data, or steal sensitive information when processing untrusted input, potentially compromising ML training pipelines and exposing proprietary model data.

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-2026-61770 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-61770 being exploited in the wild.

**How severe is CVE-2026-61770?** 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-2026-61770?** 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-2026-61770 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-61770?** 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

The vulnerability is a classic unsafe deserialization flaw in NVIDIA Megatron Bridge that processes untrusted serialized data without proper validation. An attacker can craft malicious serialized payloads that, when deserialized by the application, trigger arbitrary code execution. The attack requires network reachability to the affected service or the ability to influence the data being deserialized. Successful exploitation results in remote code execution, allowing the attacker to compromise training jobs, exfiltrate model weights, or disrupt distributed training operations. Patch status and affected version details were not provided in available references.

## 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-2026-61770](https://www.cve.org/CVERecord?id=CVE-2026-61770)

## 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)