CVE-2025-49005
LOW3.7EPSS 0.43%Next.js has a Cache poisoning vulnerability due to omission of the Vary header
Published: 7/3/2025Modified: 2/4/2026
Description
### Summary A cache poisoning issue in **Next.js App Router >=15.3.0 and < 15.3.3** may have allowed RSC payloads to be cached and served in place of HTML, under specific conditions involving middleware and redirects. This issue has been fixed in **Next.js 15.3.3**. Users on affected versions should **upgrade immediately** and **redeploy** to ensure proper caching behavior. More details: [CVE-2025-49005](https://vercel.com/changelog/cve-2025-49005)
Affected packages (1)
- npm/next>= 15.3.0, < 15.3.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |
References (8)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-49005
- PATCHhttps://github.com/vercel/next.js
- WEBhttps://github.com/vercel/next.js/commit/ec202eccf05820b60c6126d6411fe16766ecc066
- WEBhttps://github.com/vercel/next.js/issues/79346
- WEBhttps://github.com/vercel/next.js/pull/79939
- WEBhttps://github.com/vercel/next.js/releases/tag/v15.3.3
- WEBhttps://github.com/vercel/next.js/security/advisories/GHSA-r2fc-ccr8-96c4
- WEBhttps://vercel.com/changelog/cve-2025-49005