CVE-2026-44578
Next.js: Server-side request forgery in applications using WebSocket upgrades
- State
- Published
- Severity
- 8.6 High
- Published
- May 13, 2026
- Updated
- Aug 13, 2026
- Reserved
- May 6, 2026
Description
Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or cloud metadata endpoints. Vercel-hosted deployments are not affected. This vulnerability is fixed in 15.5.16 and 16.2.5.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.6 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N | GitHub_M |
| 3.1 | 8.6 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N | redhat-SADP |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
next.jsvercel |
|
References
- https://github.com/vercel/next.js/security/advisories/GHSA-c4j6-fc7j-m34r
- https://access.redhat.com/security/cve/CVE-2026-44578vdb-entry
- RHBZ#2477187issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44578.json
- https://access.redhat.com/errata/RHSA-2026:40974vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37272vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:34608vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:54435vendor-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.