CVE-2026-101896 · GHSA-ff3f-86qr-9cv3
Angular Server-Side Rendering (SSR): Denial of Service via Numeric URL Matrix Parameters
- Risk score
- 70/100
- CVSS
- 8.2 v4.0
- Exploit chance (30 days)
- 0.7%
- Published
- 30 Sep 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 du…
- Affected
- @angular/router (npm) >= 22.0.0, < 22.2.0; @angular/router (npm) >= 21.0.0, < 21.2.24; @angular/router (npm) >= 20.0.0, < 20.3.32; @angular/router (npm) <= 19.2.25
- Fix
- Upgrade @angular/router to 22.2.0 or 21.2.24 or 20.3.32 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 8.2 high
- Remotely exploitable without logging in
- On your watchlist: npm
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| @angular/router | npm | >= 22.0.0, < 22.2.0 | 22.2.0 |
| @angular/router | npm | >= 21.0.0, < 21.2.24 | 21.2.24 |
| @angular/router | npm | >= 20.0.0, < 20.3.32 | 20.3.32 |
| @angular/router | npm | <= 19.2.25 | No fix yet |
References
- https://github.com/advisories/GHSA-ff3f-86qr-9cv3
- https://github.com/angular/angular/security/advisories/GHSA-ff3f-86qr-9cv3
- https://github.com/angular/angular/issues/70716
- https://github.com/angular/angular/pull/70717
- https://github.com/angular/angular/commit/03872a80bcf1c89b2b04cdd3f444b2ee954da583
- https://github.com/angular/angular/commit/5af61216eab8bf4a6697a1d79bda3d857c06f89d
- https://github.com/angular/angular/commit/ddfe21072ba32ca4cd9d7d3c6b7df66af81d58c4
- https://github.com/advisories/GHSA-ff3f-86qr-9cv3
- https://github.com/angular/angular/releases/tag/v20.3.32
- https://github.com/angular/angular/releases/tag/v21.2.24
Original 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.
Last activity 30 Sep 2026. Patch Forecast updates every hour.