CVE-2026-64649
Next.js: Server-Side Request Forgery in Server Actions on Custom Servers
Description
Next.js is a React framework for building full-stack web applications. In versions 14.1.1 through 15.5.20 and 16.0.0 through 16.2.10, when a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host (Server-Side Request Forgery). This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtain internal values that weaken middleware/proxy authorization. Applications that use Server Actions are affected when the incoming host header is not fixed to a trusted value. This typically occurs on custom servers, or on deployments not behind a proxy that pins the host. Managed hosting pins the host upstream and is not affected; next start and standalone output do the same from version 14.2 onward. This issue has been fixed in versions 15.5.21 and 16.2.11.
INFO
Published Date :
July 27, 2026, 8:16 p.m.
Last Modified :
July 29, 2026, 2:38 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Next.js to version 15.5.21 or 16.2.11.
- Ensure incoming host headers are fixed to trusted values.
- Use a proxy to pin the host header.
- Apply vendor patches as they become available.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64649.
| URL | Resource |
|---|---|
| https://github.com/vercel/next.js/commit/b51206321854193208c0805ba42acc49287f942b | Patch |
| https://github.com/vercel/next.js/commit/e3e5666ccead3a15162793d697af5e48b7cc0498 | Patch |
| https://github.com/vercel/next.js/releases/tag/v15.5.21 | Product Release Notes |
| https://github.com/vercel/next.js/releases/tag/v16.2.11 | Product Release Notes |
| https://github.com/vercel/next.js/security/advisories/GHSA-89xv-2m56-2m9x | Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64649 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64649
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64649 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64649 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 29, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* versions from (including) 14.1.1 up to (excluding) 15.5.21 *cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* versions from (including) 16.0.0 up to (excluding) 16.2.11 Added Reference Type GitHub, Inc.: https://github.com/vercel/next.js/commit/b51206321854193208c0805ba42acc49287f942b Types: Patch Added Reference Type GitHub, Inc.: https://github.com/vercel/next.js/commit/e3e5666ccead3a15162793d697af5e48b7cc0498 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/vercel/next.js/releases/tag/v15.5.21 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/vercel/next.js/releases/tag/v16.2.11 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/vercel/next.js/security/advisories/GHSA-89xv-2m56-2m9x Types: Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 28, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-64649', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-28T14:11:48.555168Z'} -
New CVE Received by [email protected]
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'vercel', 'product': 'next.js', 'versions': [{'status': 'affected', 'version': '>= 14.1.1, < 15.5.21'}, {'status': 'affected', 'version': '>= 16.0.0 < 16.2.11'}]}] Added Description Next.js is a React framework for building full-stack web applications. In versions 14.1.1 through 15.5.20 and 16.0.0 through 16.2.10, when a Server Action forwards or redirects a request, an attacker can cause the server to send that outbound request to a malicious host (Server-Side Request Forgery). This requires the attacker's request to control Host-associated headers. In some configurations, it's also possible to obtain internal values that weaken middleware/proxy authorization. Applications that use Server Actions are affected when the incoming host header is not fixed to a trusted value. This typically occurs on custom servers, or on deployments not behind a proxy that pins the host. Managed hosting pins the host upstream and is not affected; next start and standalone output do the same from version 14.2 onward. This issue has been fixed in versions 15.5.21 and 16.2.11. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-918 Added Reference https://github.com/vercel/next.js/commit/b51206321854193208c0805ba42acc49287f942b Added Reference https://github.com/vercel/next.js/commit/e3e5666ccead3a15162793d697af5e48b7cc0498 Added Reference https://github.com/vercel/next.js/releases/tag/v15.5.21 Added Reference https://github.com/vercel/next.js/releases/tag/v16.2.11 Added Reference https://github.com/vercel/next.js/security/advisories/GHSA-89xv-2m56-2m9x