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CVE-2026-44578

75
FAUCET Score

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.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 13.4.13, < 15.5.16CPE matchmatch criteria
cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*
>= 16.0.0, < 16.2.5CPE matchmatch criteria
cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

8.6HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
38.87%
Probability of exploitation in next 30 days
EPSS Percentile
98.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Nuclei: CVE-2026-44578 · May 16, 2026
This CVE's current EPSS score of 0.3887 is in the 97th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

npmpatch availablevia ghsa
Product: nextFixed in: 15.5.16
npmpatch availablevia ghsa
Product: nextFixed in: 16.2.5
github_advisoryworkaround availablevia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-c4j6-fc7j-m34rhigh

Next.js vulnerable to server-side request forgery in applications using WebSocket upgrades

May 11, 2026

References

access.redhat.com / errata/RHSA-2026:34608
access.redhat.com / errata/RHSA-2026:37272
access.redhat.com / errata/RHSA-2026:40974
access.redhat.com / security/cve/CVE-2026-44578
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-44578.json
github.com / vercel/next.js/security/advisories/GHSA-c4j6-fc7j-m34r
MitigationVendor Advisory