CVE-2026-50171: @angular/common Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-p3vc-36g9-x9gr",
  "modified" : "2026-07-15T22:05:15Z",
  "published" : "2026-06-15T16:52:30Z",
  "aliases" : [ "CVE-2026-50171" ],
  "summary" : "@angular/common: Denial of Service (DoS) via OOM in Number Formatting (digitsInfo)",
  "details" : "A Denial of Service (DoS) vulnerability exists in the `@angular/common` package of Angular. The `formatNumber` function, which is also utilized by `DecimalPipe`, `PercentPipe`, and `CurrencyPipe`, does not properly validate the upper bounds of the `digitsInfo` parameter. Specifically, the minimum and maximum fraction digits parsed from the `digitsInfo` string (e.g., `1.2-4`) are converted to integers and used without limits.\n\nWhen parsing a maliciously crafted `digitsInfo` string with excessively large fraction digit values (e.g., `1.200000000-200000000`), the internal `roundNumber` function attempts to pad the digits array to match the requested fraction size. This results in an unbounded loop that repeatedly pushes elements into an array.\n\n### Impact\n\nSuccessful exploitation of this vulnerability allows an attacker to trigger resource exhaustion, leading to a Denial of Service (DoS):\n\n* **Server-Side Rendering (SSR):** In applications using SSR (e.g., `@angular/ssr`), an attacker can crash the Node.js server process due to a `JavaScript heap out of memory` error. This affects the availability of the application for all users.  \n* **Client-Side Rendering (CSR):** In standard client-side applications, the unbounded loop will block the main thread, freezing the user's browser tab and making it unresponsive.\n\n### Attack Preconditions\n\nFor this vulnerability to be exploitable, the following conditions must be met:\n\n1. **Vulnerable Component Usage:** The application must use Angular's number formatting utilities, such as the `formatNumber` function directly, or via template pipes (`DecimalPipe`, `PercentPipe`, `CurrencyPipe`).  \n2. **Attacker-Controlled Parameter:** The `digitsInfo` parameter passed to these utilities must be customizable or directly controlled by untrusted user input (e.g., parsed from query parameters, user preference settings, or API responses that accept user-defined formatting options). If `digitsInfo` is trusted or limited to a known, defined range for its value, the vulnerability is not exploitable by external attackers.\n\n### Patches\n- 22.0.0-rc.2\n- 21.2.15\n- 20.3.22\n- 19.2.23\n\n### Credits\nThis vulnerability was discovered and reported by [CodeMender from Google DeepMind](https://deepmind.google/blog/introducing-codemender-an-ai-agent-for-code-security/).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "22.0.0-next.0"
      }, {
        "fixed" : "22.0.0-rc.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "20.0.0-next.0"
      }, {
        "fixed" : "20.3.22"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "19.0.0-next.0"
      }, {
        "fixed" : "19.2.23"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "18.2.14"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "21.0.0-next.0"
      }, {
        "fixed" : "21.2.15"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/security/advisories/GHSA-p3vc-36g9-x9gr"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50171"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/pull/68840"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/angular/angular"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-834" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-15T16:52:30Z",
    "nvd_published_at" : "2026-06-22T18:16:42Z"
  }
}