CVEs / CVE-2026-44578
CVE-2026-44578: vercel next.js vulnerability
- high 8.6 CVSS 3.1 (from the CNA)
- EPSS 35.5% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| vercel next.js | >= 16.0.0, < 16.2.5 | — |
| vercel next.js | >= 13.4.13, < 15.5.16 | — |
| Product | Affected | Fixed in |
|---|---|---|
| next (npm) | from 13.4.13, before 15.5.16 | 15.5.16 |
| next (npm) | from 16.0.0, before 16.2.5 | 16.2.5 |
Package versions from GHSA-c4j6-fc7j-m34r.
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 30 Oct 2026.
Severity
| CVSS 3.1 | 8.6 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:NScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-918 |
References
- CVE-2026-44578 on NVD
- CVE-2026-44578 on OSV
- https://github.com/vercel/next.js/security/advisories/GHSA-c4j6-fc7j-m34r Mitigation, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:34608
- https://access.redhat.com/errata/RHSA-2026:37272
- https://access.redhat.com/errata/RHSA-2026:40974
- https://access.redhat.com/errata/RHSA-2026:54435
- https://access.redhat.com/security/cve/CVE-2026-44578
- https://bugzilla.redhat.com/show_bug.cgi?id=2477187
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44578.json
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.