Update dependency @angular/common to v21.2.19 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@angular/common (source)	21.2.17 → 21.2.19

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Angular: Cache-Key Ambiguity in HttpTransferCache Leading to Cross-Request Response Reuse and State Poisoning

CVE-2026-68945 / GHSA-jhpw-976m-542j

More information

Details

Angular's HttpTransferCache caches HTTP requests made during Server-Side Rendering (SSR) so that they can be reused during client-side hydration.

During SSR, HttpTransferCache previously generated identical key material for distinct request parameters when repeated values were present because repeated values were joined with commas:

new HttpParams().set('role', 'user,admin')
new HttpParams().append('role', 'user').append('role', 'admin')

Both requests previously serialized as role=user,admin, allowing distinct HttpClient requests to produce the same transfer-cache key material.

Impact

In an SSR application, this cache-key ambiguity can make a later security-sensitive HttpClient request receive the response from an earlier semantically different request in the same render. For example, an attacker-influenced scalar-comma request can be cached and then replayed as the response for a trusted repeated-param authorization or data request to the same URL. As a result, Angular's server-rendered output can be based on the wrong backend response because the trusted request is not dispatched. This can lead to:

• State Poisoning: Using incorrect or attacker-influenced cached responses for subsequent application logic.
• Cross-Request Response Reuse: Reusing cached responses across requests with semantically different parameters.

Patched Versions

• 22.0.2
• 21.2.19
• 20.3.27

Workarounds

If you cannot upgrade immediately, configure your HttpClient requests to skip transfer caching for sensitive endpoints where repeated parameter keys are used:

this.http.get('/api/resource', {
  transferCache: false
});

Alternatively, disable the HTTP transfer cache globally in your application bootstrap config:

import { provideClientHydration, withNoHttpTransferCache } from '@angular/platform-browser';

export const appConfig = {
  providers: [
    provideClientHydration(
      withNoHttpTransferCache()
    )
  ]
};

Severity

• CVSS Score: 8.8 / 10 (High)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

References

• https://github.com/angular/angular/security/advisories/GHSA-jhpw-976m-542j
• https://github.com/angular/angular/pull/68571
• https://github.com/angular/angular/commit/6867f77ec779a0a24f6339ad6c775f444202103c
• https://github.com/angular/angular/commit/948a8d6831e8920b54663ec79421da95210e0e35
• https://github.com/angular/angular/commit/a64e2883e9dc4abdac70209129be303de79e5b2b
• https://github.com/angular/angular/commit/a6c7fc5c13e6e494a4c9bd8e773b8d4b2a99b20c
• https://github.com/advisories/GHSA-jhpw-976m-542j

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

angular/angular (@​angular/common)

v21.2.19

Compare Source

compiler

Commit	Type	Description
e2660c3dee	fix	disallow i18n event attributes
7b884f585a	fix	restrict possible event handler check to property names longer than 2 characters

http

Commit	Type	Description
948a8d6831	fix	distinguish repeated transfer cache params
9949dccce1	fix	enable xsrf for root-provided HttpClient

platform-server

Commit	Type	Description
f34a93c946	fix	update domino to latest version

v21.2.18

Compare Source

compiler-cli

Commit	Type	Description
8d22cc953b	fix	update babel dependencies to latest v7

core

Commit	Type	Description
6bcce117fb	fix	avoid caching missing locale data
5a693bafcd	fix	reject dynamic script host elements

http

Commit	Type	Description
91df739b80	fix	prevent caching of responses with Set-Cookie headers

service-worker

Commit	Type	Description
1804f73bec	fix	preserve referrer in asset requests
e86c31bf26	fix	preserve referrer policy in asset requests

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