CVE-2026-44437
Description
The Angular SSR is a server-rise rendering tool for Angular applications. From 19.0.0-next.0 to before 19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7, a vulnerability exists in the X-Forwarded-Prefix header processing logic within Angular SSR. The internal validation mechanism fails to properly account for URL-encoded characters, specifically dots (%2e%2e). This allows an attacker to bypass security filters by injecting encoded path traversal sequences that are later decoded and utilized by the application logic. When an Angular SSR application is configured to trust proxy headers and is deployed behind a proxy that forwards the X-Forwarded-Prefix header without prior sanitization, an attacker can provide a payload such as /%2e%2e/evil. This vulnerability is fixed in19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7.
How to fix
- angular angular_cli19.2.25, 20.3.25, 21.2.9 or later
- @angular/ssr22.0.0-next.7, 21.2.9, 20.3.25, 19.2.25 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| angular angular_cli | 19.0.0 ≤ v < 19.2.25, 20.0.0 ≤ v < 20.3.25, 21.0.0 ≤ v < 21.2.9, 22.0.0 | 19.2.25, 20.3.25, 21.2.9 |
| @angular/ssrnpm | 22.0.0-next.0 ≤ v < 22.0.0-next.7, 21.0.0-next.0 ≤ v < 21.2.9, 20.0.0-next.0 ≤ v < 20.3.25, 19.0.0-next.0 ≤ v < 19.2.25 | 22.0.0-next.7, 21.2.9, 20.3.25, 19.2.25 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.