CVE-2026-45109 Details
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.
A vulnerability in Next.js middleware processing with Turbopack has been identified, allowing for proxy bypass in App Router applications. This issue arises because the fix for CVE-2026-44575 did not properly address middleware.ts when used with Turbopack. The vulnerability affects Next.js versions 15.2.0 prior to 15.5.18 and 16.0.0 prior to 16.2.6.
Users can upgrade to Next.js versions 15.5.18 or 16.2.6 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2026:34608 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:37272 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:40974 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:54435 | redhat-SADP | |
| https://access.redhat.com/security/cve/CVE-2026-45109 | redhat-SADP | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2477190 | redhat-SADP | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45109.json | redhat-SADP | |
| https://github.com/vercel/next.js/security/advisories/GHSA-26hh-7cqf-hhc6 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-288 | Authentication Bypass Using an Alternate Path or Channel | [email protected] |
| CWE-358 | Improperly Implemented Security Check for Standard | redhat-SADP |
Affected Products
| Product | Versions |
|---|---|
| vercel next.js | >= 15.2.0, < 15.5.18 >= 16.0.0, < 16.2.6 |
CPE
Remediation
| |
Change History
10 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 13, 2026 | CVE Modified | redhat-SADP |
| Jul 16, 2026 | CVE Modified | redhat-SADP |
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jul 10, 2026 | CVE Modified | redhat-SADP |
| Jul 3, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| May 14, 2026 | Initial Analysis | [email protected] |
| May 13, 2026 | New CVE Received | [email protected] |