Next.js cache poisoning due to omission of Vary header
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| vercel | next.js | affected |
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Configuration 1 [-]
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No data.
| Vendor | Product | Versions |
|---|---|---|
| Vercel | Next.js | — |
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2025-19911 | Next.js has a Cache poisoning vulnerability due to omission of the Vary header |
Github GHSA |
GHSA-r2fc-ccr8-96c4 | Next.js has a Cache poisoning vulnerability due to omission of the Vary header |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.491% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Vercel vercel
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| CPEs | cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* cpe:2.3:a:vercel:vercel:*:*:*:*:*:*:*:* |
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| Vendors & Products |
Vercel vercel
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| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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| Type | Values Removed | Values Added |
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| References |
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| Metrics |
threat_severity
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threat_severity
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| Description | Next.js is a React framework for building full-stack web applications. In Next.js App Router from 15.3.0 to before 15.3.3 and Vercel CLI from 41.4.1 to 42.2.0, a cache poisoning vulnerability was found. The issue allowed page requests for HTML content to return a React Server Component (RSC) payload instead under certain conditions. When deployed to Vercel, this would only impact the browser cache, and would not lead to the CDN being poisoned. When self-hosted and deployed externally, this could lead to cache poisoning if the CDN does not properly distinguish between RSC / HTML in the cache keys. This issue has been resolved in Next.js 15.3.3. | |
| Title | Next.js cache poisoning due to omission of Vary header | |
| Weaknesses | CWE-444 | |
| References |
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| Metrics |
cvssV3_1
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