---
id: CVE-2026-102989
title: >-
  TanStack Router is a client-first, server-capable, fully type-safe router and
  full-stack framework for the web
summary: >-
  TanStack Router is a client-first, server-capable, fully type-safe router and
  full-stack framework for the web. From 1.143.12 until 1.169.39 for
  @tanstack/start-server-core, 1.168.60 for @tanstack/react-start, 1.168.57 for
  @tanstack/soli…
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T17:17:14.797'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102989'
references:
  - url: >-
      https://github.com/TanStack/router/commit/d521abd71c69f1ff010bb3def4d417cb5fa058cb
    label: security-advisories@github.com
  - url: 'https://github.com/TanStack/router/pull/8573'
    label: security-advisories@github.com
  - url: 'https://github.com/TanStack/router/releases/tag/release-2026-09-30-1747'
    label: security-advisories@github.com
  - url: 'https://github.com/TanStack/router/security/advisories/GHSA-qx66-fv34-fjm8'
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-13T17:38:53.176Z'
---

## Overview

TanStack Router is a client-first, server-capable, fully type-safe router and full-stack framework for the web. From 1.143.12 until 1.169.39 for @tanstack/start-server-core, 1.168.60 for @tanstack/react-start, 1.168.57 for @tanstack/solid-start, and 1.168.56 for @tanstack/vue-start, an unauthenticated attacker can place non-public fields in a server-function request payload so that attacker-controlled middleware state reaches the error path and a response-shaped object is accepted as an HTTP response. A crafted server-function URL can therefore return attacker-controlled HTML from the application's origin; when a visitor opens the URL, the injected script can access same-origin data and issue requests with the visitor's authority. This issue is fixed in @tanstack/start-server-core 1.169.39, @tanstack/react-start 1.168.60, @tanstack/solid-start 1.168.57, and @tanstack/vue-start 1.168.56.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.