Question: What is CVE-2025-21620?
Answer: CVE-2025-21620 is a vulnerability classified as high with a CVSS score of 7.5. It falls under CWE-200 and affects the system as follows: Deno is a JavaScript, TypeScript, and WebAssembly runtime with secure defaults. When you send a request with the Authorization header to one domain, and the response asks to redirect to a different domain, Deno'sfetch() redirect handling creates a follow-up redirect request that keeps the original Authorization header, leaking its content to that second domain. This vulnerability is fixed in 2.1.2.