CVE-2026-44579 — Next.js: Denial of Service via connection exhaustion in applications using Cache Components

Description (CNA)

Next.js is a React framework for building full-stack web applications. From to before 15.5.16 and 16.2.5, applications using Partial Prerendering through the Cache Components feature can be vulnerable to connection exhaustion through crafted POST requests to a server action. In affected configurations, a malicious request can trigger a request-body handling deadlock that leaves connections open for an extended period, consuming file descriptors and server capacity until legitimate users are denied service. This vulnerability is fixed in 15.5.16 and 16.2.5.

Affected (CNA)

Vendor / product	Versions
vercel / next.js	affected >= 16.0.0, < 16.2.5; affected >= 15.0.0, < 15.5.16

CWE

CWE-770

References

https://github.com/vercel/next.js/security/advisories/GHSA-mg66-mrh9-m8jx

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in Next.js. Applications utilizing Partial Prerendering via the Cache Components feature are susceptible to connection exhaustion. A remote attacker can send crafted POST requests to a server action, triggering a request-body handling deadlock. This leaves connections open, consuming server resources and ultimately leading to a Denial of Service (DoS) for legitimate users.