EUVD-2026-69308
GHSA-wqfr-x5qq-jx74
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low privileges required to reach the deserialization sink; full CIA impact on the training host is consistent with arbitrary code execution.
Primary rating from Vendor (nvidia).
CVSS VectorVendor: nvidia
Lifecycle Timeline
2DescriptionCVE.org
NVIDIA Megatron Bridge contains a vulnerability where an attacker could cause a deserialization of untrusted data. A successful exploit of this vulnerability might lead to code execution, data tampering, and information disclosure.
Articles & Coverage 2
AnalysisAI
Deserialization of untrusted data in NVIDIA Megatron Bridge allows a local attacker with low-privilege access to execute arbitrary code, tamper with data, and disclose sensitive information. The CVSS vector (AV:L/AC:L/PR:L) indicates the vulnerability is exploitable locally without elevated privileges or user interaction, making it a significant risk in multi-tenant distributed AI training environments where multiple users share infrastructure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local account on the host running NVIDIA Megatron Bridge, consistent with the CVSS AV:L/PR:L metrics. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS score of 7.8 (High) is well-supported by the vector metrics: local access with low privileges and no user interaction needed, yielding full CIA impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Consult the NVIDIA Product Security advisory at https://github.com/NVIDIA/product-security/tree/main/2026/5868 for the official patch and affected version list - no specific fixed version is confirmed in the available input data, so 'Patch available per vendor advisory' applies. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all systems running NVIDIA Megatron Bridge in multi-tenant environments and restrict low-privilege user access to isolated namespaces where possible. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
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External POC / Exploit Code
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