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[ CVE-2026-101896 · Published 14 Oct 2026 ]

Angular Server-Side Rendering (SSR): Denial of Service via Numeric URL Matrix Parameters

CVSS 8.2 EPSS <1%1 agency advisoryFix available

[ Description ]Official description

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.32, 21.2.24, and 22.2.0, the @angular/router URL parser stores numeric matrix parameter names and numeric outlet names as properties on initially empty JavaScript objects during Node.js server-side rendering. V8 can interpret these URL-derived keys as array indices and allocate dense backing stores sized to high numeric values, so repeated small path segments cause disproportionate per-segment heap consumption. An unauthenticated attacker can send overlapping requests containing repeated numeric matrix parameters when SSR is enabled, the router directly parses the request URL, and upstream proxies allow semicolons and multiple path segments, eventually exhausting the Node.js old-space heap and terminating the SSR worker. Pure client-side Angular applications are not affected. This issue is fixed in versions 20.3.32, 21.2.24, and 22.2.0.

[ Fixes ]Fixes and patches

  • @angular/router 22.2.0Fixed version · GitHub Advisories · npm package @angular/router: upgrade to 22.2.0 or later (affected >= 22.0.0, < 22.2.0)
  • @angular/router 21.2.24Fixed version · GitHub Advisories · npm package @angular/router: upgrade to 21.2.24 or later (affected >= 21.0.0, < 21.2.24)
  • @angular/router 20.3.32Fixed version · GitHub Advisories · npm package @angular/router: upgrade to 20.3.32 or later (affected >= 20.0.0, < 20.3.32)

[ Advisories ]Government CERT advisories

[ Packages ]Affected open-source packages

[ References ]References