EUVD-2026-69333
GHSA-6m9w-55hw-mfgv
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector and low privilege confirmed by description requiring host-level access; full-triad high impact consistent with arbitrary code execution via deserialization.
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 privileges to achieve code execution, data tampering, and information disclosure on the host system. The CVSS:3.1 vector (AV:L/PR:L) confirms this is a local-access vulnerability targeting NVIDIA's distributed large-model training infrastructure, where a compromised or malicious low-privileged user on the same host could supply a crafted serialized payload to the Bridge component. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Local access to the host running NVIDIA Megatron Bridge is required, with at minimum a low-privileged operating system account (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score is credible given the full-triad high impact (C:H/I:H/A:H), but the local attack vector (AV:L) and low-privilege prerequisite (PR:L) substantially constrain real-world risk compared to network-exploitable deserialization bugs. … 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 | The primary remediation is to apply the patch or updated version specified in the NVIDIA Product Security advisory at https://github.com/NVIDIA/product-security/tree/main/2026/5868 - an exact fix version is not confirmed from the currently available input data (upstream fix available per vendor advisory; patched version not independently verified). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running NVIDIA Megatron Bridge and catalog local user accounts and their assigned privilege levels. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
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External POC / Exploit Code
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