{"id":"CVE-2026-50171","aliases":["GHSA-p3vc-36g9-x9gr"],"url":"https://o3.security/vulnerability/CVE-2026-50171","summary":"Angular: 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/).","published":"2026-06-22T15:49:51.774Z","modified":"2026-08-12T03:51:46.221930008Z","cvss":null,"epss":{"score":0.00256,"percentile":0.17443,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@angular/common","fixedVersion":"22.0.0-rc.2"},{"ecosystem":"npm","name":"@angular/common","fixedVersion":"20.3.22"},{"ecosystem":"npm","name":"@angular/common","fixedVersion":"19.2.23"},{"ecosystem":"npm","name":"@angular/common","fixedVersion":null},{"ecosystem":"npm","name":"@angular/common","fixedVersion":"21.2.15"}],"fix":{"url":"https://github.com/angular/angular/pull/68840","label":"angular/angular#68840"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50171.json"},{"type":"ADVISORY","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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:46.221930008Z"}}