CVE-2025-33248

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{"affected": [{"configurations": [{"platform": ["all_platforms"], "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.15.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Megatron LM", "source": "cna", "vendor": "NVIDIA"}, "product": "megatron-lm", "vendor": "nvidia"}], "analysis": {"en": {"generated_at": "2026-03-26T01:42:59.474325+00:00", "value": {"mitigation_remediation": ["Apply the latest NVIDIA Megatron\u2011LM security patch to the hybrid conversion script as soon as it becomes available.", "If a patch is not yet available, disable or remove the hybrid conversion script from your environment to prevent execution of untrusted files.", "Monitor your systems for the presence of suspicious input files or attempts to trigger the conversion process.", "Keep a close eye on NVIDIA support channels or the referenced advisories for further updates or work\u2011arounds."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "This issue affects NVIDIA Megatron\u2011LM products. All versions of the Megatron\u2011LM hybrid conversion script that have not applied the vendor\u2019s security update are vulnerable; specific affected releases are not enumerated in the available data.", "description_and_impact": "NVIDIA Megatron\u2011LM includes a vulnerability in its hybrid conversion script that allows an attacker to execute arbitrary code by tricking a user into loading a specially crafted file. The flaw can enable not only code execution but also privilege escalation, data disclosure, and tampering, compromising both confidentiality and integrity of the system.", "risk_and_exploitability": "The CVSS score of 7.8 indicates a high severity vulnerability, while the EPSS score of less than 1% suggests low likelihood of exploitation at present. The vulnerability is not listed in the CISA KEV catalog. Attackers would need to persuade a user to run the malicious file, after which the script would deserialize the payload and execute it, exploiting a deserialization flaw (CWE\u2011502)."}}}}, "created": "2026-03-25T11:46:03.927476+00:00", "updated": "2026-03-26T12:18:49.463485+00:00", "vendors": ["nvidia", "nvidia$PRODUCT$megatron-lm"]}