Path Equivalence Affecting fast-uri package, versions <2.4.8>=3.0.0 <3.1.9>=4.0.0 <4.2.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-FASTURI-21279306
- published20 Oct 2026
- disclosed20 Oct 2026
- creditzekth
Introduced: 20 Oct 2026
NewCVE-2026-110095 (opens in a new tab)How to fix?
Upgrade fast-uri to version 2.4.8, 3.1.9, 4.2.3 or higher.
Overview
fast-uri is a Dependency-free RFC 3986 URI toolbox
Affected versions of this package are vulnerable to Path Equivalence via the serialize() / normalize() functions, which incorrectly applied RFC 3986 remove_dot_segments to relative-path references. That algorithm is defined only for merged target paths, not for relative references themselves, so normalizing a relative path such as a/../b produced /b (root-relative), x/.. produced /, and ../x produced x. An attacker who can supply a relative URI reference can cause it to resolve to a different resource than intended after normalization, enabling path-traversal-style target substitution.