Interpretation Conflict Affecting next package, versions >=15.3.0 <15.3.3
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-NEXT-10598338
- published4 Jul 2025
- disclosed3 Jul 2025
- creditUnknown
Introduced: 3 Jul 2025
NewCVE-2025-49005 (opens in a new tab)How to fix?
Upgrade next to version 15.3.3 or higher.
Overview
next is a react framework.
Affected versions of this package are vulnerable to Interpretation Conflict in the Server class, which may accept and cache Vary headers. An attacker can poison a browser cache (or a CDN cache in self-hosted environment) with RSC content passed in as HTML, which is served to other users.
Workaround
This vulnerability can be avoided by adding the Vary header to RSC responses with Vary: RSC, Next-Router-State-Tree, Next-Router-Prefetch, or by clearing the cache with middleware.