# CVE-2026-61766: NVIDIA Megatron Bridge unsafe deserialization

Source: https://junglewise.ai/threats/cve-2026-61766-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-2026-61766 · Severity: high · CVSS 7.8 · Published 2026-09-01

NVIDIA Megatron Bridge is a machine learning library component used to parallelize and optimize model training. A deserialization flaw allows remote attackers to execute arbitrary code or tamper with training data, potentially compromising model integrity and enabling full system compromise on affected infrastructure.

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-2026-61766 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-61766 being exploited in the wild.

**How severe is CVE-2026-61766?** High severity, with a CVSS score of 7.8, published 1 September 2026.

**Which products and versions are affected?** Nvidia Megatron-Bridge <UNKNOWN>.

**Is there a fix for CVE-2026-61766?** 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-2026-61766 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-61766?** Check whether you run Nvidia Megatron-Bridge or Nvidia Nemo Megatron Bridge at an affected version. 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

This vulnerability is a classic unsafe deserialization flaw in NVIDIA Megatron Bridge. An attacker can supply malicious serialized data that, when deserialized by the application without proper validation, triggers arbitrary code execution. The attack vector is network-based and does not require prior authentication or user interaction. Successful exploitation leads to remote code execution (RCE), information disclosure, and data tampering. A patch is expected from NVIDIA; check their product security advisories for remediation guidance.

## Affected products

- NVIDIA Megatron Bridge <UNKNOWN>

## 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-2026-61766](https://www.cve.org/CVERecord?id=CVE-2026-61766)

## 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)