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

CVE-2025-21620 · Severity: low · CVSS 3 · Published 2025-01-06

fetch: Authorization headers not dropped when redirecting cross-origin

Technologies: deno (crates.io). Vendors: crates.io.

Quick answers

Is CVE-2025-21620 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-21620 being exploited in the wild.
How severe is CVE-2025-21620?
Low severity, with a CVSS score of 3, published 6 January 2025.
Which products and versions are affected?
deno (crates.io) SEMVER:introduced=0,last_affected=1.46.3; deno_fetch (crates.io) SEMVER:introduced=0.0.1,fixed=0.204.0.
Is there a fix for CVE-2025-21620?
Yes. deno_fetch (crates.io): upgrade to 0.204.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-21620?
Check whether you run deno (crates.io) or deno_fetch (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • deno_fetch (crates.io): upgrade to 0.204.0 or later
    cargo update -p deno_fetch

Affected products

  • deno (crates.io) SEMVER:introduced=0,last_affected=1.46.3
  • deno_fetch (crates.io) SEMVER:introduced=0.0.1,fixed=0.204.0

Identifiers

  • CVE-2025-21620
  • GHSA-f27p-cmv8-xhm6

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