Low 3.7Published Jul 3, 2025

CVE-2025-49005Next.js cache poisoning due to omission of Vary header

Updated under an hour ago (Nov 2, 2026, 12:23 AM ET)

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It affects vercel next.js and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Start free and add your stackFree account, 3 products Every CVE for vercel next.js Exploited in the last 30 days

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.

CVSS: 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-444
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 8, 2025
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

vercel next.js vercel:next.js (from the name)	from 15.3.0, < 15.3.3	CNA record
vercel next.js vercel:next.js	from 15.3.0 before 15.3.3	NVD
vercel vercel vercel:vercel	from 41.4.1 before 42.2.0	NVD

References

References

https://github.com/vercel/next.js/security/advisories/GHSA-r2fc-ccr8-96c4	x-refsource-confirm, vendor-advisory
https://github.com/vercel/next.js/issues/79346	x-refsource-misc, exploit, issue-tracking
https://github.com/vercel/next.js/commit/ec202eccf05820b60c6126d6411fe16766ecc066	x-refsource-misc, patch
https://github.com/vercel/next.js/releases/tag/v15.3.3	x-refsource-misc, release-notes
https://vercel.com/changelog/cve-2025-49005	x-refsource-misc, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.