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Vulnerability details

7.5/10
CVSS 3.1
CVE-2026-18446
resolved Published 2026-07-31 Updated 2026-09-02
NVD MITRE OpenCVE
Vulnerability Data from Dependency-Track
Affected versions
Score
7.5 CVSS 3.1 NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Description
fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applications that use fast-uri to enforce host based policy such as allowlists, SSRF filtering, or redirect validation before passing the same URL into Node's URL or fetch consumers can be steered to an unintended host. Upgrade to fast-uri 4.1.2, 3.1.5, or 2.4.4.
Same vulnerability as
GHSA-7p8r-x3mc-p8w7 resolved according to EUVD-2026-51553
Analysis Read only
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