Connection Exhaustion Vulnerability in Next.js Framework by Vercel
CVE-2026-44579

7.5HIGH

Key Information:

Vendor

Vercel
Status
Next.js
Vendor
CVE Published:
13 May 2026

What is CVE-2026-44579?

Next.js, a popular React framework, is susceptible to a connection exhaustion issue when using the Partial Prerendering feature with Cache Components. Malicious actors can exploit this vulnerability by sending crafted POST requests, leading to a request-body handling deadlock. This situation keeps connections open for long periods, which can exhaust server resources such as file descriptors, ultimately denying service to legitimate users. Versions 15.5.16 and 16.2.5 have addressed this security concern.

Affected Version(s)

next.js >= 16.0.0, < 16.2.5 < 16.0.0, 16.2.5

next.js >= 15.0.0, < 15.5.16 < 15.0.0, 15.5.16

References

https://github.com/vercel/next.js/security/advisories/GHS...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.