{"id":"CVE-2025-27221","aliases":["GHSA-22h5-pq3x-2gf2"],"url":"https://o3.security/vulnerability/CVE-2025-27221","summary":"URI allows for userinfo Leakage in URI#join, URI#merge, and URI#+","details":"There is a possibility for userinfo leakage by in the uri gem.\nThis vulnerability has been assigned the CVE identifier CVE-2025-27221. We recommend upgrading the uri gem.\n\n## Details\n\nThe methods `URI#join`, `URI#merge`, and `URI#+` retained userinfo, such as `user:password`, even after the host is replaced. When generating a URL to a malicious host from a URL containing secret userinfo using these methods, and having someone access that URL, an unintended userinfo leak could occur.\n\nPlease update URI gem to version 0.11.3, 0.12.4, 0.13.2, 1.0.3 or later.\n\n## Affected versions\n\nuri gem versions < 0.11.3, 0.12.0 to 0.12.3, 0.13.0, 0.13.1 and 1.0.0 to 1.0.2.\n\n## Credits\n\nThanks to Tsubasa Irisawa (lambdasawa) for discovering this issue.\nAlso thanks to nobu for additional fixes of this vulnerability.","published":"2025-03-03T00:00:00Z","modified":"2026-08-12T03:51:36.756124196Z","cvss":{"score":3.2,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N"},"epss":{"score":0.00493,"percentile":0.4006,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"uri","fixedVersion":"0.11.3"},{"ecosystem":"RubyGems","name":"uri","fixedVersion":"0.12.4"},{"ecosystem":"RubyGems","name":"uri","fixedVersion":"0.13.2"},{"ecosystem":"RubyGems","name":"uri","fixedVersion":"1.0.3"}],"fix":{"url":"https://github.com/ruby/uri/pull/154","label":"ruby/uri#154"},"references":[{"type":"WEB","url":"https://hackerone.com/reports/2957667"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00008.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00015.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27221.json"},{"type":"ADVISORY","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/uri/CVE-2025-27221.yml"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27221"},{"type":"WEB","url":"https://github.com/ruby/uri/pull/154"},{"type":"WEB","url":"https://github.com/ruby/uri/pull/155"},{"type":"WEB","url":"https://github.com/ruby/uri/pull/156"},{"type":"WEB","url":"https://github.com/ruby/uri/pull/157"},{"type":"PACKAGE","url":"https://github.com/ruby/uri"},{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2025-27221"},{"type":"WEB","url":"https://www.ruby-lang.org/en/news/2025/02/26/security-advisories"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:36.756124196Z"}}