npm · @angular/common
Angular: Cache-Key Ambiguity in HttpTransferCache Leading to Cross-Request Response Reuse and State Poisoning
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.
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:
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()
)
]
};
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Check my repoSources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.