Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/angular/angular-cli/pull/33031
- https://github.com/angular/angular-cli/security/advisories/GHSA-69xr-m8h6-h664
FAQ
What is CVE-2026-44437?
CVE-2026-44437 is a documented vulnerability. 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 hea...
How severe is CVE-2026-44437?
CVSS scoring is not yet available for CVE-2026-44437. Check NVD for updates.
Is there a patch for CVE-2026-44437?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.