Faraday affected by SSRF via protocol-relative URL host override in build_exclusive_url
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Prior to 2.14.1, Faraday's build_exclusive_url method (in lib/faraday/connection.rb) uses Ruby's URI#merge to combine the connection's base URL with a user-supplied path. Per RFC 3986, protocol-relative URLs (e.g. //evil.com/path) are treated as network-path references that override the base URL's host/authority component. This means that if any application passes user-controlled input to Faraday's get(), post(), build_url(), or other request methods, an attacker can supply a protocol-relative URL like //attacker.com/endpoint to redirect the request to an arbitrary host, enabling Server-Side Request Forgery (SSRF). This vulnerability is fixed in 2.14.1.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-25765
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 02:13 UTC · Revision 1
Source evidence
Faraday affected by SSRF via protocol-relative URL host override in build_exclusive_url
core-osv · Original sourcePublished 9 Feb 2026, 20:30 UTC
Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Prior to 2.14.1, Faraday's build_exclusive_url method (in lib/faraday/connection.rb) uses Ruby's URI#merge to combine the connection's base URL with a user-supplied path. Per RFC 3986, protocol-relative URLs (e.g. //evil.com/path) are treated as network-path references that override the base URL's host/authority component. This means that if any application passes user-controlled input to Faraday's get(), post(), build_url(), or other request methods, an attacker can supply a protocol-relative URL like //attacker.com/endpoint to redirect the request to an arbitrary host, enabling Server-Side Request Forgery (SSRF). This vulnerability is fixed in 2.14.1.
osv:CVE-2026-25765
Complete source record
{
"id": "53c171e5f7bb6ee725027a6ada076058a22ebce62b9a9dd6c067971e0c7f20d1",
"url": "https://osv.dev/vulnerability/CVE-2026-25765",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Faraday affected by SSRF via protocol-relative URL host override in build_exclusive_url",
"summary": "Faraday is an HTTP client library abstraction layer that provides a common interface over many adapters. Prior to 2.14.1, Faraday's build_exclusive_url method (in lib/faraday/connection.rb) uses Ruby's URI#merge to combine the connection's base URL with a user-supplied path. Per RFC 3986, protocol-relative URLs (e.g. //evil.com/path) are treated as network-path references that override the base URL's host/authority component. This means that if any application passes user-controlled input to Faraday's get(), post(), build_url(), or other request methods, an attacker can supply a protocol-relative URL like //attacker.com/endpoint to redirect the request to an arbitrary host, enabling Server-Side Request Forgery (SSRF). This vulnerability is fixed in 2.14.1.",
"evidence": "osv:CVE-2026-25765",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-25765",
"aliases": [
"CVE-2026-25765",
"GHSA-33mh-2634-fwr2"
],
"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
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"repo": "https://github.com/lostisland/faraday",
"type": "GIT",
"events": [
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"source": "REFERENCES_COMMIT"
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25765.json"
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],
"modified": "2026-10-28T02:30:25.297097619Z",
"provider": "osv",
"references": [
"https://github.com/lostisland/faraday/releases/tag/v2.14.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25765.json",
"https://github.com/lostisland/faraday/security/advisories/GHSA-33mh-2634-fwr2",
"https://nvd.nist.gov/vuln/detail/CVE-2026-25765",
"https://github.com/lostisland/faraday/commit/a6d3a3a0bf59c2ab307d0abd91bc126aef5561bc"
],
"provider_metadata": {
"cwe_ids": [
"CWE-918"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25765.json"
}
},
"related_cves": [
{
"value": "CVE-2026-25765",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 491807,
"published_at": "2026-02-09T20:30:58.774+00:00"
}