CVE-2025-33247
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedNVIDIA Megatron LM contains a vulnerability in quantization configuration loading, which could allow remote code execution. A successful exploit of this vulnerability might lead to code execution, escalation of privileges, information disclosure, and data tampering.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceNVIDIA Megatron LM has a vulnerability in its quantization configuration loading mechanism. The vulnerability allows attackers to execute arbitrary code through malicious quantization configuration files. This affects the model training pipeline where quantized weights and quantization parameters are loaded.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 0.15.3CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed Megatron LM versionRun pip show megatron-lm or check your dependency lock file for the megatron-lm package versionAffected if Version is lower than 0.15.3
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Determine if quantization is in useSearch your training scripts and config files for quantization-related parameters such as quantize_weights, quantization_config, or fp8-related settingsAffected if Quantization features are enabled in your training configuration
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Locate quantization configuration filesSearch your project for files named quant_config.json, quantization.yaml, or similar files that define quantization parameters, and identify their loading mechanismAffected if Custom or external quantization config files are loaded without validation
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Inspect quantization config loading codeReview the code paths in your Megatron LM installation that handle quantization config loading, typically in the model parallel or quantization modulesAffected if The code loads quantization configs from untrusted or user-controlled sources without schema validation
You are affected if you are running Megatron LM versions below 0.15.3 and your training pipeline loads quantization configuration files, especially from untrusted or external sources.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped0.15.3
Validate and sanitize quantization configuration files before loading. Implement schema validation for quantization parameters and restrict loading to trusted, signed configuration sources.
0.15.3 or later
- 1. Ensure you have a backup of your current Megatron LM installation and all associated data.
- 2. Upgrade Megatron LM to version 0.15.3 or later by following your project's dependency management method (e.g., pip install, conda, or source installation).
- 3. Verify the upgrade was successful by checking the installed version (e.g., `pip show megatron-lm` or equivalent).
- 4. Test that your quantization workflows function correctly with the new version before deploying to production.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-33247 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-33247 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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