Angular CLI up to 20.3.35/21.2.22/22.1.6 Prerendered Page Retrieval @angular/ssr/node CommonEngine.retrieveSSGPage path traversal

Summaryinfo

A vulnerability, which was classified as problematic, was found in Angular CLI up to 20.3.35/21.2.22/22.1.6. This affects the function CommonEngine.retrieveSSGPage of the file @angular/ssr/node of the component Prerendered Page Retrieval. Executing a manipulation can lead to path traversal. This vulnerability is tracked as CVE-2026-104871. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Angular CLI up to 20.3.35/21.2.22/22.1.6 and classified as problematic. This vulnerability affects the function CommonEngine.retrieveSSGPage of the file @angular/ssr/node of the component Prerendered Page Retrieval. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-104871 since 10/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 20.3.36, 21.2.23 or 22.1.7 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• JavaScript Library

Vendor

• Angular

Name

• CLI

Version

• 20.3.0
• 20.3.1
• 20.3.2
• 20.3.3
• 20.3.4
• 20.3.5
• 20.3.6
• 20.3.7
• 20.3.8
• 20.3.9
• 20.3.10
• 20.3.11
• 20.3.12
• 20.3.13
• 20.3.14
• 20.3.15
• 20.3.16
• 20.3.17
• 20.3.18
• 20.3.19
• 20.3.20
• 20.3.21
• 20.3.22
• 20.3.23
• 20.3.24
• 20.3.25
• 20.3.26
• 20.3.27
• 20.3.28
• 20.3.29
• 20.3.30
• 20.3.31
• 20.3.32
• 20.3.33
• 20.3.34
• 20.3.35
• 21.2.0
• 21.2.1
• 21.2.2
• 21.2.3
• 21.2.4
• 21.2.5
• 21.2.6
• 21.2.7
• 21.2.8
• 21.2.9
• 21.2.10
• 21.2.11
• 21.2.12
• 21.2.13
• 21.2.14
• 21.2.15
• 21.2.16
• 21.2.17
• 21.2.18
• 21.2.19
• 21.2.20
• 21.2.21
• 21.2.22
• 22.1.0
• 22.1.1
• 22.1.2
• 22.1.3
• 22.1.4
• 22.1.5
• 22.1.6

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