CVE-2025-21620

Deno's authorization headers not dropped when redirecting cross-origin

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.07%
Affected: denoland deno
Published at:
Updated at:

References

Link Tags
https://github.com/denoland/deno/security/advisories/GHSA-f27p-cmv8-xhm6

Frequently Asked Questions

What is the severity of CVE-2025-21620?
CVE-2025-21620 has been scored as a high severity vulnerability.
How to fix CVE-2025-21620?
To fix CVE-2025-21620, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21620 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-21620 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21620?
CVE-2025-21620 affects denoland deno.
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