CVE-2025-49005
Next.js has a Cache poisoning vulnerability due to omission of the Vary header
3.7
LOW
CVSS 3.1
EPSS 0.43%
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)
How to fix CVE-2025-49005
To remediate CVE-2025-49005, upgrade the affected package to a fixed version below.
- —upgrade to 15.3.3 or later
Is CVE-2025-49005 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 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 |