---
id: CVE-2026-104871
title: The Angular SSR is a server-rise rendering tool for Angular applications
summary: >-
  The Angular SSR is a server-rise rendering tool for Angular applications.
  Prior to versions 20.3.36, 21.2.23, and 22.1.7, the CommonEngine
  retrieveSSGPage prerendered-page retrieval logic in @angular/ssr/node, and in
  @angular/ssr for ver…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-22
vendor: angular
product: angular-cli
affected:
  - angular-cli < 20.3.36
  - 'angular-cli >= 21.0.0, < 21.2.23'
  - 'angular-cli >= 22.0.0, < 22.1.7'
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T21:16:54.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104871'
references:
  - url: >-
      https://github.com/angular/angular-cli/commit/645e41a47d21b7651837a4250de99af0509626e2
    label: security-advisories@github.com
  - url: >-
      https://github.com/angular/angular-cli/commit/70748ca8e76fe4b42798719410336119d943e755
    label: security-advisories@github.com
  - url: >-
      https://github.com/angular/angular-cli/commit/bb72145f9ab45aee29f523236b3a25cd0813a841
    label: security-advisories@github.com
  - url: >-
      https://github.com/angular/angular-cli/commit/c3e5982e49705f0f6a913cb94622b4c555d2d914
    label: security-advisories@github.com
  - url: 'https://github.com/angular/angular-cli/releases/tag/v20.3.36'
    label: security-advisories@github.com
  - url: 'https://github.com/angular/angular-cli/releases/tag/v21.2.23'
    label: security-advisories@github.com
  - url: 'https://github.com/angular/angular-cli/releases/tag/v22.1.7'
    label: security-advisories@github.com
  - url: >-
      https://github.com/angular/angular-cli/security/advisories/GHSA-7g7c-h8rr-7p6q
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-02T20:12:27.563771Z'
cvssSource: cna
ingestedAt: '2026-10-02T22:33:09.843Z'
---

## Overview

The Angular SSR is a server-rise rendering tool for Angular applications. Prior to versions 20.3.36, 21.2.23, and 22.1.7, the CommonEngine retrieveSSGPage prerendered-page retrieval logic in @angular/ssr/node, and in @angular/ssr for versions 17 through 18, accepts a relative request URL containing a backslash parent-traversal segment on Windows. The non-special resolve:// URL base preserves the backslash, path.join interprets it as a Windows separator, and the pagePath.startsWith(normalize(publicPath)) check incorrectly accepts a sibling output directory whose name shares the configured public-directory prefix. An unauthenticated requester can therefore retrieve a sibling prerendered HTML page when that page contains the Angular SSG marker. The issue is limited to Windows deployments that pass relative request URLs to CommonEngine.render, have a prefix-sharing sibling output directory, and contain qualifying prerendered Angular HTML; it does not provide arbitrary file read. This issue is fixed in versions 20.3.36, 21.2.23, and 22.1.7.

## Remediation

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