Incorrect Behavior Order Affecting ai package, versions <5.0.52>=5.1.0-beta.0 <5.1.0-beta.9
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-AI-13863465
- published9 Nov 2025
- disclosed7 Nov 2025
- creditaphantom
Introduced: 7 Nov 2025
NewCVE-2025-48985 (opens in a new tab)How to fix?
Upgrade ai to version 5.0.52, 5.1.0-beta.9 or higher.
Overview
ai is an AI SDK by Vercel - The AI Toolkit for TypeScript and JavaScript
Affected versions of this package are vulnerable to Incorrect Behavior Order via the downloadAssets function. An attacker can upload files with disallowed types by substituting arbitrary downloaded bytes for different supported URLs within the same prompt, thereby bypassing the URL and filetype whitelisting.
Workaround
Implementing custom file type validation logic outside of the SDK.