{"cve":"CVE-2025-21620","nvd":{"published":"2025-01-06T23:15:07.770","modified":"2026-06-17T08:43:52.293","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-200"],"references":["https://github.com/denoland/deno/security/advisories/GHSA-f27p-cmv8-xhm6"],"products":[],"source":"nvd","synced_at":"2026-10-19T21:57:56.913276502+00:00"},"epss":{"cve":"CVE-2025-21620","score":0.00522,"percentile":0.44286,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-f27p-cmv8-xhm6","url":"https://osv.dev/vulnerability/GHSA-f27p-cmv8-xhm6","summary":"fetch: Authorization headers not dropped when redirecting cross-origin","modified":"2025-01-07T02:52:55Z","packages":[{"ecosystem":"crates.io","name":"deno_fetch","purl":"pkg:cargo/deno_fetch","ranges":[">=0.0.1 <0.204.0"],"fixed":["0.204.0"]},{"ecosystem":"crates.io","name":"deno","purl":"pkg:cargo/deno","ranges":["<=1.46.3"],"fixed":[]},{"ecosystem":"crates.io","name":"deno","purl":"pkg:cargo/deno","ranges":[">=2.0.0 <2.1.2"],"fixed":["2.1.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}