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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-101896
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 16:17:29 UTC
Updated2026-10-14 16:17:29 UTC
DescriptionAngular 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.

Risk And Classification

Primary CVSS: v4.0 8.2 HIGH from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-400 | CWE-770 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.2HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED8.2HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Angular Angular affected <= 19.2.25 Not specified
CNA Angular Angular affected >= 20.0.0, < 20.3.32 Not specified
CNA Angular Angular affected >= 21.0.0, < 21.2.24 Not specified
CNA Angular Angular affected >= 22.0.0, < 22.2.0 Not specified
CNA @angular Router affected <= 19.2.25 Not specified
CNA @angular Router affected >= 20.0.0, < 20.3.32 Not specified
CNA @angular Router affected >= 21.0.0, < 21.2.24 Not specified
CNA @angular Router affected >= 22.0.0, < 22.2.0 Not specified

References

ReferenceSourceLinkTags
github.com/angular/angular/issues/70716 [email protected] github.com
github.com/angular/angular/releases/tag/v22.2.0 [email protected] github.com
github.com/angular/angular/commit/03872a80bcf1c89b2b04cdd3f444b2ee954da583 [email protected] github.com
github.com/angular/angular/security/advisories/GHSA-ff3f-86qr-9cv3 [email protected] github.com
github.com/angular/angular/releases/tag/v21.2.24 [email protected] github.com
github.com/angular/angular/commit/ddfe21072ba32ca4cd9d7d3c6b7df66af81d58c4 [email protected] github.com
github.com/angular/angular/commit/5af61216eab8bf4a6697a1d79bda3d857c06f89d [email protected] github.com
github.com/angular/angular/pull/70717 [email protected] github.com
github.com/angular/angular/releases/tag/v20.3.32 [email protected] github.com
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