VULNERABILITY INTELLIGENCE

CVE-2025-21620

CVSS score7.5 HIGH
EPSS probability0.52%
CISA KEVNot currently listed
Published2025-01-06
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

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.

Weakness classification

  • security-advisories@github.com: CWE-200

Primary references