High

Remote Code Execution in NVIDIA Megatron LM Quantization Configuration Loading

IdentifiersCVE-2025-33247CWE-502· Deserialization of Untrusted Data

CVE-2025-33247 is a high-severity vulnerability in NVIDIA Megatron LM related to quantization configuration loading. According to the provided content, improper handling of quantization configuration data can allow remote code execution. Successful exploitation may result in code execution and can further enable privilege escalation, information disclosure, and data tampering. No additional technical detail about the specific vulnerable function, parser, or code path is provided in the available content.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

A successful exploit could allow an attacker to execute code in the context of the affected Megatron LM environment. The provided content further indicates possible downstream impacts including privilege escalation, disclosure of sensitive information, and tampering with data. In AI training or LLM deployment environments, this could plausibly affect training workloads and expose sensitive training data, but the precise scope is not specified in the available content.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure by restricting who can supply or modify quantization configuration inputs, limiting network access to systems running Megatron LM, and isolating training and model-processing environments from untrusted users and adjacent enterprise systems. Monitor for unexpected configuration changes and suspicious process execution originating from Megatron LM workflows. These are general mitigations inferred from the described attack surface; vendor-specific mitigation guidance is not provided in the available content.

Remediation

Patch, then assume compromise.

Apply the NVIDIA security update for Megatron LM that addresses CVE-2025-33247, as referenced in NVIDIA's March 2026 security advisories. The provided content does not include fixed version information, so the specific patched release is currently not available from the supplied data.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

NvidiaMegatron-Lmapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

5 SOURCESView more in app

cyber security newsNews

Mar 27, 2026

Critical NVIDIA Vulnerabilities Enables RCE and DoS Attacks

A high-severity vulnerability affecting NVIDIA Megatron LM; the content notes multiple flaws could disrupt large-language-model deployments or expose sensitive training data.

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Exposure mapping

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Threat actor evidence

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Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity4