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TI-2026-74070 Aliases CVE-2026-101896

Denial of service in Angular SSR via numeric URL matrix parameters

Priority MEDIUM 43CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

The @angular/router package is affected from 20.0.0 before 20.3.32, from 21.0.0 before 21.2.24, from 22.0.0 before 22.2.0, and through 19.2.25. Numeric matrix parameter names are stored as object properties, which V8 turns into large heap allocations (CWE-400). An unauthenticated remote attacker can exhaust the Node.js heap and crash the server-side rendering worker when SSR is enabled. Pure client-side applications are not affected.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00909 60th percentileScored 2026-11-07
Fix Fixed angular (angular): 20.3.32, 21.2.24, 22.2.0router (@angular): 20.3.32, 21.2.24, 22.2.0+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
angularangularup to 19.2.25; 20.0.0 to before 20.3.32; 21.0.0 to before 21.2.24; 22.0.0 to before 22.2.020.3.32, 21.2.24, 22.2.0Patch availableCNA
angularrouterup to 19.2.25; 20.0.0 to before 20.3.32; 21.0.0 to before 21.2.24; 22.0.0 to before 22.2.020.3.32, 21.2.24, 22.2.0Patch availableCNA
—@angular/router (npm)22.0.0 to before 22.2.022.2.0Patch availableGHSA-ff3f-86qr-9cv3
—@angular/router (npm)21.0.0 to before 21.2.2421.2.24Patch availableGHSA-ff3f-86qr-9cv3
—@angular/router (npm)20.0.0 to before 20.3.3220.3.32Patch availableGHSA-ff3f-86qr-9cv3
—@angular/router (npm)up to 19.2.25—No fix listedGHSA-ff3f-86qr-9cv3
  • angular Vendorangular Affected up to 19.2.25; 20.0.0 to before 20.3.32; 21.0.0 to before 21.2.24; 22.0.0 to before 22.2.0 Fixed in 20.3.32, 21.2.24, 22.2.0 Patch available CNA
  • router Vendorangular Affected up to 19.2.25; 20.0.0 to before 20.3.32; 21.0.0 to before 21.2.24; 22.0.0 to before 22.2.0 Fixed in 20.3.32, 21.2.24, 22.2.0 Patch available CNA
  • @angular/router (npm) Vendor— Affected 22.0.0 to before 22.2.0 Fixed in 22.2.0 Patch available GHSA-ff3f-86qr-9cv3
  • @angular/router (npm) Vendor— Affected 21.0.0 to before 21.2.24 Fixed in 21.2.24 Patch available GHSA-ff3f-86qr-9cv3
  • @angular/router (npm) Vendor— Affected 20.0.0 to before 20.3.32 Fixed in 20.3.32 Patch available GHSA-ff3f-86qr-9cv3
  • @angular/router (npm) Vendor— Affected up to 19.2.25 Fixed in — No fix listed GHSA-ff3f-86qr-9cv3

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:angular:angular:*:*:*:*:*:*:*:*——angular
  • cpe:2.3:a:angular:angular:*:*:*:*:*:*:*:* Versions — — ·angular

Remediation

Update Angular to 20.3.32, 21.2.24 or 22.2.0, the first fixed versions in each release line. No fixed version is listed for @angular/router 19.2.25 and earlier.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA angular (angular) Fixed in 20.3.32, 21.2.24, 22.2.0
  • Fix · CNA router (@angular) Fixed in 20.3.32, 21.2.24, 22.2.0
  • Fix · GHSA-ff3f-86qr-9cv3 @angular/router (npm) Fixed in 22.2.0 Advisory →
  • Fix · GHSA-ff3f-86qr-9cv3 @angular/router (npm) Fixed in 21.2.24 Advisory →
  • Fix · GHSA-ff3f-86qr-9cv3 @angular/router (npm) Fixed in 20.3.32 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-14 Threatist record created from CVE-2026-101896
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-20 CISA SSVC decision points changed
  4. 2026-10-20 Priority changed: LOW → MEDIUM
  5. 2026-11-06 Affected versions changed · Red Hat
  6. 2026-11-06 CVSS score added · Red Hat

References

Other 10

  • TI-2026-74069 Infinite loop in Angular SSR HTML parser allows denial of service CVSS 4.0HIGH 8.7
  • TI-2026-60076 Angular: SSRF and Cross-Origin Credential Disclosure via URL Resolution Discrepancy in SSR CVSS 4.0HIGH 8.6
  • TI-2026-60080 Angular: SSR XSS via Unescaped <template> Content Across DocumentFragment Boundaries in Fallback Raw-Content Elements CVSS 4.0HIGH 8.6
  • TI-2026-60078 Angular: SSR XSS via Unescaped Processing Instruction (<?...?>) Nodes in Fallback Raw-Content Elements CVSS 4.0HIGH 8.6
  • TI-2025-38694 Server-Side Request Forgery (SSRF) in Angular SSR CVSS 4.0HIGH 8.7
  • TI-2026-22098 Angular SSR has an Open Redirect via X-Forwarded-Prefix CVSS 4.0MEDIUM 6.9
See all 46 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences