CVE-2025-21620: fetch: Authorization headers not dropped when redirecting cross-origin

January 6, 2025 (updated January 7, 2025)

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.

References

github.com/advisories/GHSA-f27p-cmv8-xhm6
github.com/denoland/deno
github.com/denoland/deno/security/advisories/GHSA-f27p-cmv8-xhm6
nvd.nist.gov/vuln/detail/CVE-2025-21620

Code Behaviors & Features

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