Input validation error in Next.js - CVE-2025-49005
Published: July 4, 2025
Vulnerability identifier: #VU112179
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2025-49005
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: vercel
Affected software:
Next.js
Next.js
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a cache poisoning attack.
The vulnerability exists due to omission of Vary HTTP header when creating cache data in App Router. A remote attacker can force the application to cache RSC payloads and serve them in place of HTML code under specific conditions involving middleware and redirects.
How to mitigate CVE-2025-49005
Install updates from vendor's website.
Sources
- https://github.com/vercel/next.js/commit/ec202eccf05820b60c6126d6411fe16766ecc066
- https://github.com/vercel/next.js/issues/79346
- https://github.com/vercel/next.js/releases/tag/v15.3.3
- https://github.com/vercel/next.js/security/advisories/GHSA-r2fc-ccr8-96c4
- https://vercel.com/changelog/cve-2025-49005