{"id":"CVE-2026-33637","aliases":["GHSA-5rv5-xj5j-3484"],"url":"https://o3.security/vulnerability/CVE-2026-33637","summary":"Faraday: Protocol-relative URI objects still bypass host scoping (possible incomplete fix for GHSA-33mh-2634-fwr2)","details":"Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Versions 2.0.0 through 2.14.1 still allow protocol-relative host override when the request target is passed as a URI object (rather than a String) to Faraday::Connection#build_exclusive_url. This bypasses the February 2026 fix for GHSA-33mh-2634-fwr2 and enables off-host request forgery: a request built from a fixed-base Faraday::Connection can be redirected to an attacker-controlled host, forwarding connection-scoped values such as Authorization headers and default query parameters. This issue has been fixed in version 2.14.3.","published":"2026-05-19T17:44:42.557Z","modified":"2026-08-12T03:51:38.972056748Z","cvss":{"score":0,"severity":"NONE","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N"},"epss":{"score":0.00272,"percentile":0.1947,"asOf":"2026-08-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"faraday","fixedVersion":"2.14.2"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33637.json"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-33mh-2634-fwr2"},{"type":"ADVISORY","url":"https://github.com/lostisland/faraday/security/advisories/GHSA-5rv5-xj5j-3484"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33637"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:38.972056748Z"}}