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Vulnerability · Published Oct 14, 2026 · Assigned by GitHub_M

CVE-2026-101896Angular: Denial of Service via Numeric URL Matrix Parameters in Server-Side Rendering (SSR)

High 8.2

In plain English

A high-severity uncontrolled resource consumption in angular from angular. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.2High
Exploit odds (30 days)0.9%top 39.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12angular.jsno fix listedDEBIAN-CVE-2026-101896
Debian:13angular.jsno fix listedDEBIAN-CVE-2026-101896
npm@angular/router22.2.0GHSA-ff3f-86qr-9cv3
npm@angular/router21.2.24GHSA-ff3f-86qr-9cv3
npm@angular/router20.3.32GHSA-ff3f-86qr-9cv3
npm@angular/routerno fix listedGHSA-ff3f-86qr-9cv3

Affected products (as reported)

VendorProductVersions
angular angular <= 19.2.25>= 20.0.0, < 20.3.32>= 21.0.0, < 21.2.24>= 22.0.0, < 22.2.0
@angular router <= 19.2.25>= 20.0.0, < 20.3.32>= 21.0.0, < 21.2.24>= 22.0.0, < 22.2.0

Weakness: CWE-400, CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References