Angular: Denial of Service via Numeric URL Matrix Parameters in Server-Side Rendering (SSR)
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.
CVE-2026-101896
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-101896
angular
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
router
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "angular",
"product": "angular",
"versions": [
{
"status": "affected",
"version": "<= 19.2.25"
},
{
"status": "affected",
"version": ">= 20.0.0, < 20.3.32"
},
{
"status": "affected",
"version": ">= 21.0.0, < 21.2.24"
},
{
"status": "affected",
"version": ">= 22.0.0, < 22.2.0"
}
]
},
{
"vendor": "@angular",
"product": "router",
"versions": [
{
"status": "affected",
"version": "<= 19.2.25"
},
{
"status": "affected",
"version": ">= 20.0.0, < 20.3.32"
},
{
"status": "affected",
"version": ">= 21.0.0, < 21.2.24"
},
{
"status": "affected",
"version": ">= 22.0.0, < 22.2.0"
}
]
}
]- Related CVEs
- CVE-2026-101896
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #42051 · Revision 1
- Added to Heist Feed
- Publisher date