CVE-2026-68945: Angular Cache-Key Ambiguity Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-jhpw-976m-542j",
  "modified" : "2026-08-03T15:59:13Z",
  "published" : "2026-08-03T15:59:13Z",
  "aliases" : [ "CVE-2026-68945" ],
  "summary" : "Angular: Cache-Key Ambiguity in HttpTransferCache Leading to Cross-Request Response Reuse and State Poisoning",
  "details" : "Angular's `HttpTransferCache` caches HTTP requests made during Server-Side Rendering (SSR) so that they can be reused during client-side hydration.\n\nDuring SSR, `HttpTransferCache` previously generated identical key material for distinct request parameters when repeated values were present because repeated values were joined with commas:\n\n```ts\nnew HttpParams().set('role', 'user,admin')\nnew HttpParams().append('role', 'user').append('role', 'admin')\n```\n\nBoth requests previously serialized as `role=user,admin`, allowing distinct `HttpClient` requests to produce the same transfer-cache key material.\n\n### Impact\n\nIn 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:\n\n- **State Poisoning**: Using incorrect or attacker-influenced cached responses for subsequent application logic.\n- **Cross-Request Response Reuse**: Reusing cached responses across requests with semantically different parameters.\n\n### Patched Versions\n\n- 22.0.2\n- 21.2.19\n- 20.3.27\n\n### Workarounds\n\nIf you cannot upgrade immediately, configure your `HttpClient` requests to skip transfer caching for sensitive endpoints where repeated parameter keys are used:\n\n```ts\nthis.http.get('/api/resource', {\n  transferCache: false\n});\n```\n\nAlternatively, disable the HTTP transfer cache globally in your application bootstrap config:\n\n```ts\nimport { provideClientHydration, withNoHttpTransferCache } from '@angular/platform-browser';\n\nexport const appConfig = {\n  providers: [\n    provideClientHydration(\n      withNoHttpTransferCache()\n    )\n  ]\n};\n```",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "22.0.0-next.0"
      }, {
        "fixed" : "22.0.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "21.0.0-next.0"
      }, {
        "fixed" : "21.2.19"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "20.0.0-next.0"
      }, {
        "fixed" : "20.3.27"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "19.2.25"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/security/advisories/GHSA-jhpw-976m-542j"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/pull/68571"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/commit/6867f77ec779a0a24f6339ad6c775f444202103c"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/commit/948a8d6831e8920b54663ec79421da95210e0e35"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/commit/a64e2883e9dc4abdac70209129be303de79e5b2b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/commit/a6c7fc5c13e6e494a4c9bd8e773b8d4b2a99b20c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/angular/angular"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-345" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-03T15:59:13Z",
    "nvd_published_at" : null
  }
}