Patches: upgrade to fast-uri 4.1.1, 3.1.4, or 2.4.3.
Workarounds: none.
Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-v2hh-gcrm-f6hx | fast-uri vulnerable to host confusion via literal backslash authority delimiter |
Tue, 21 Jul 2026 00:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Fast-uri
Fast-uri fast-uri |
|
| Vendors & Products |
Fast-uri
Fast-uri fast-uri |
Mon, 20 Jul 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Sun, 19 Jul 2026 14:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Impact: fast-uri versions from 2.3.1 through 4.1.0 (including the 3.x line up to 3.1.3 and the 2.x line up to 2.4.2) do not treat a literal backslash character (U+005C) as an authority delimiter. Node's native WHATWG URL parser, used by fetch, undici, and Node's http and https clients, normalizes the backslash to a forward slash for special schemes such as http, https, ws, wss, ftp, and file. As a result, the two parsers extract different hosts from the same input string. Applications that use fast-uri to enforce host-based policy such as allowlists, denylists, loopback or SSRF filtering, redirect validation, or outbound proxy routing before passing the same URL into Node's URL or fetch consumers can be steered to an unintended destination, including cloud metadata endpoints, loopback, or internal hosts. Patches: upgrade to fast-uri 4.1.1, 3.1.4, or 2.4.3. Workarounds: none. | |
| Title | fast-uri vulnerable to host confusion via literal backslash authority delimiter | |
| Weaknesses | CWE-436 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-07-20T13:53:42.583Z
Reserved: 2026-07-18T11:37:36.004Z
Link: CVE-2026-16221
Updated: 2026-07-20T13:53:37.076Z
No data.
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OpenCVE Enrichment
Updated: 2026-07-21T00:30:18Z
Github GHSA