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6.3 Medium

CVE-2026-104871 The Angular SSR is a server-rise rendering tool for Angular applications

Description

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.

Affected products and versions

Product Affected versions Fixed in
angular-cli 22.0 22.0.0 → < 22.1.7 22.1.7
angular-cli 21.0 21.0.0 → < 21.2.23 21.2.23
angular-cli 20.3 earliest → < 20.3.36 20.3.36

References

Timeline

  1. Published
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Other CVEs of angular-cli

The 6 CVEs of angular-cli →
CVE-2026-44437 The Angular SSR is a server-rise rendering tool for Angular applications 6.9 Medium CVE-2026-33397 The Angular SSR is a server-rise rendering tool for Angular applications 6.9 Medium CVE-2026-27739 The Angular SSR is a server-rise rendering tool for Angular applications 9.2 Critical CVE-2026-27738 The Angular SSR is a server-rise rendering tool for Angular applications 6.9 Medium
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