# CVE-2026-61772: NVIDIA Megatron Bridge deserialization of untrusted data

Source: https://junglewise.ai/threats/cve-2026-61772-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-2026-61772 · Severity: high · CVSS 7.8 · Published 2026-09-01

NVIDIA Megatron Bridge is a library used to train large language models by distributing computation across multiple GPUs. A flaw in how it processes serialized data could allow an attacker to execute arbitrary code or steal sensitive information during model training or inference operations.

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-2026-61772 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-61772 being exploited in the wild.

**How severe is CVE-2026-61772?** 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-2026-61772?** 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-2026-61772 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-61772?** 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 deserialization flaw in NVIDIA Megatron Bridge that permits an attacker to deserialize untrusted data, potentially leading to arbitrary code execution. The exact attack vector and preconditions (e.g., whether network access or authentication is required) are not fully detailed in the available advisory text. A successful exploit could result in code execution, data tampering, or information disclosure within the context of the affected system. Patch availability has not been confirmed in the provided information.

## 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-2026-61772](https://www.cve.org/CVERecord?id=CVE-2026-61772)

## 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)