Angular: Denial of Service (DoS) via OOM in Number Formatting (digitsInfo)

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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.

Source published

22 Jun 2026 15:49:51 UTC

Source modified

23 Jun 2026 16:02:07 UTC

Saved here

23 Oct 2026 15:48:27 UTC

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CVE Program Terms of Use

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CVSS 4.0 · 8.2 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

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.

Source published

Jun 22, 2026, 3:49:51 PM (timezone not stated)

Source modified

Jun 23, 2026, 4:02:07 PM (timezone not stated)

Saved here

15 Nov 2026 14:46:40 UTC

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EUVD CVSS 4.0 · 8.2 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

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.

Source published

22 Jun 2026 18:16:42 UTC

Source modified

9 Jul 2026 15:41:41 UTC

Saved here

25 Oct 2026 12:17:38 UTC

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CVSS 4.0 · [email protected] · Secondary · 8.2 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS 3.1 · [email protected] · Primary · 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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. ### 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 a `JavaScript heap out of memory` error. 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: 1. **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`). 2. **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. ### 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](https://deepmind.google/blog/introducing-codemender-an-ai-agent-for-code-security/).

Source published

15 Jun 2026 16:52:30 UTC

Source modified

10 Sep 2026 03:51:09 UTC

Saved here

24 Oct 2026 13:17:17 UTC

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GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS_V4 · 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

Publisher rating · HIGH