{"id":"CVE-2025-21620","aliases":["GHSA-f27p-cmv8-xhm6"],"url":"https://o3.security/vulnerability/CVE-2025-21620","summary":"Deno's authorization headers not dropped when redirecting cross-origin","details":"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.","published":"2025-01-06T22:26:40.723Z","modified":"2026-08-08T03:30:22.067514620Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"deno_fetch","fixedVersion":"0.204.0"},{"ecosystem":"crates.io","name":"deno","fixedVersion":null},{"ecosystem":"crates.io","name":"deno","fixedVersion":"2.1.2"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21620.json"},{"type":"ADVISORY","url":"https://github.com/denoland/deno/security/advisories/GHSA-f27p-cmv8-xhm6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21620"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-08T03:30:22.067514620Z"}}