CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2025-21620
High (7.5). EPSS 0.5% chance of exploitation in the next 30 days. Fixed in deno_fetch 0.204.0.
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.
Severity
- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 44% of CVEs (scores of 2026-10-31)
- CWE
- CWE-200
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-f27p-cmv8-xhm6 | crates.io | deno_fetch | >=0.0.1 <0.204.0 | 0.204.0 |
| GHSA-f27p-cmv8-xhm6 | crates.io | deno | <=1.46.3 | no fix published |
| GHSA-f27p-cmv8-xhm6 | crates.io | deno | >=2.0.0 <2.1.2 | 2.1.2 |