CVE-2026-54264 angular CVE debrief

Who should care

Developers and administrators using the Angular framework, particularly those using the @angular/service-worker package, should be aware of this vulnerability. The vulnerability allows a remote attacker to obtain sensitive credentials, making it a high-priority issue to address. Affected versions include those prior to 22.0.1, 21.2.17, and 20.3.25.

Technical summary

The @angular/service-worker package in the Angular framework has an information disclosure vulnerability, CVE-2026-54264. When the Service Worker fetches assets, it preserves metadata from the original request. However, on cross-origin redirects, the Service Worker fails to strip sensitive headers, violating the Fetch redirect algorithm. This allows a remote attacker to obtain sensitive credentials by triggering a cross-origin redirect to an untrusted external origin. The vulnerability is fixed in 22.0.1, 21.2.17, and 20.3.25.

Defensive priority

High priority should be given to updating the @angular/service-worker package to a fixed version (22.0.1, 21.2.17, or 20.3.25) to prevent exploitation of this vulnerability. Developers and administrators should review their dependencies and update them accordingly.

Recommended defensive actions

• Update the @angular/service-worker package to version 22.0.1, 21.2.17, or 20.3.25.
• Review and update dependencies to ensure that all affected versions are addressed.
• Monitor for potential exploitation attempts and review logs for suspicious activity.
• Consider implementing additional security measures, such as validating and sanitizing user input.
• Keep the Angular framework and its dependencies up to date with the latest security patches.

Evidence notes

The CVE-2026-54264 vulnerability is documented in the official CVE record and the NVD detail page. The vulnerability is caused by the Service Worker's failure to strip sensitive headers on cross-origin redirects, allowing a remote attacker to obtain sensitive credentials. The issue is fixed in 22.0.1, 21.2.17, and 20.3.25.

Official resources