Cloudanix VulnDB

CVE-2026-44437

Medium · 6.1

CVSS

6.1

EPSS

0.3%

Published

May 13, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed
npm @angular/ssr 19.0.0-next.0 19.2.25
npm @angular/ssr 20.0.0-next.0 20.3.25
npm @angular/ssr 21.0.0-next.0 21.2.9
npm @angular/ssr 22.0.0-next.0 22.0.0-next.7

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