CVE-2026-45109

HIGH

Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes

Title source: cna
STIX 2.1

Description

Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0001
EPSS Percentile 3.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-288
Status published
Products (5)
npm/next 15.2.0 - 15.5.18npm
npm/next 16.0.0 - 16.2.6npm
vercel/next.js 15.2.0 - 15.5.18
vercel/next.js >= 15.2.0, < 15.5.17
vercel/next.js >= 16.0.0, < 16.2.6
Published May 13, 2026
Tracked Since May 13, 2026