CVE-2026-25765
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Fixed | 2.14.1-1 |
| forky | Fixed | 2.14.1-1 |
| bullseye | Affected | — |
| bookworm | Affected | — |
References
- 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/pull/1569
- https://github.com/lostisland/faraday/commit/a6d3a3a0bf59c2ab307d0abd91bc126aef5561bc
- https://github.com/lostisland/faraday
- https://github.com/lostisland/faraday/releases/tag/v1.10.5
- https://github.com/lostisland/faraday/releases/tag/v2.14.1
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/faraday/CVE-2026-25765.yml
- https://www.rfc-editor.org/rfc/rfc3986#section-5.2.2
- https://www.rfc-editor.org/rfc/rfc3986#section-5.4
- https://security-tracker.debian.org/tracker/CVE-2026-25765
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.