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Vulnerability · Published May 13, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity resource allocation without limits in next.js from vercel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 45.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
npmnext15.5.16GHSA-mg66-mrh9-m8jx
npmnext16.2.5GHSA-mg66-mrh9-m8jx

Affected products (as reported)

VendorProductVersions
vercel next.js >= 16.0.0, < 16.2.5>= 15.0.0, < 15.5.16

Weakness: CWE-770, CWE-833 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References