Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22, and 19.2.23, 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. When 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. This vulnerability is fixed in 22.0.0-rc.2, 21.2.15, 20.3.22, and 19.2.23.
Angular: Denial of Service (DoS) via OOM in Number Formatting (digitsInfo)
Problem type
Affected products
angular
>= 22.0.0-next.0, < 22.0.0-rc.2 - AFFECTED
>= 21.0.0-next.0, < 21.2.15 - AFFECTED
>= 20.0.0-next.0, < 20.3.22 - AFFECTED
>= 19.0.0-next.0, < 19.2.23 - AFFECTED
<= 18.2.14 - AFFECTED
References
GitHub Security Advisories
GHSA-p3vc-36g9-x9gr
@angular/common: Denial of Service (DoS) via OOM in Number Formatting (digitsInfo)
https://github.com/advisories/GHSA-p3vc-36g9-x9grA 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.
When 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.
Impact
Successful exploitation of this vulnerability allows an attacker to trigger resource exhaustion, leading to a Denial of Service (DoS):
- Server-Side Rendering (SSR): In applications using SSR (e.g.,
@angular/ssr), an attacker can crash the Node.js server process due to aJavaScript heap out of memoryerror. This affects the availability of the application for all users. - 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.
Attack Preconditions
For this vulnerability to be exploitable, the following conditions must be met:
- Vulnerable Component Usage: The application must use Angular's number formatting utilities, such as the
formatNumberfunction directly, or via template pipes (DecimalPipe,PercentPipe,CurrencyPipe). - Attacker-Controlled Parameter: The
digitsInfoparameter 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). IfdigitsInfois trusted or limited to a known, defined range for its value, the vulnerability is not exploitable by external attackers.
Patches
- 22.0.0-rc.2
- 21.2.15
- 20.3.22
- 19.2.23
Credits
This vulnerability was discovered and reported by CodeMender from Google DeepMind.
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-50171Click to expand
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