Medium severity · published Jul 27, 2026
CVE-2026-64645
Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostname
6.1
CVSS
0.4%
EPSS
No
On KEV
Description
Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a
rewrites() or redirects() rule that builds its external destination hostname from request-controlled input can be pointed at an arbitrary hostname, regardless of the rule's hostname suffix. For a rewrite, Next.js proxies the request to that arbitrary host and serves the response from the application's origin, leading to Server-Side Request forgery. A redirects() rule configured this way is vulnerable to an Open Redirect. This issue has been fixed in versions 15.5.21 and 16.2.11.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
next.js · vercel
>= 12.0.0 < 15.5.21; >= 16.0.0, < 16.2.11 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64645
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64645
Patch
https://github.com/vercel/next.js/commit/35f501357e9b0fe7c950b0d6aa8fcf5343f707e9
Patch
https://github.com/vercel/next.js/commit/d3033266c6dff23f7be71e19341fe3a8c6e2c599
Product
https://github.com/vercel/next.js/releases/tag/v15.5.21
Product
https://github.com/vercel/next.js/releases/tag/v16.2.11
Mitigation
https://github.com/vercel/next.js/security/advisories/GHSA-p9j2-gv94-2wf4
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