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-21279301
- published20 Oct 2026
- disclosed20 Oct 2026
- creditUlises Gascón
Introduced: 20 Oct 2026
NewCVE-2026-110725 (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(), and resolve() functions when called with the non-default option reference: 'suffix' on a reference that has no authority. A bare colon in the first path segment of the emitted relative reference is not escaped, violating RFC 3986 section 3.3/4.2, which causes the output to reparse as an absolute URI with a scheme rather than a relative reference. An attacker who can influence the URI being serialized can exploit this to inject an unintended scheme into the output.
Note: This is only exploitable when the non-default reference: 'suffix' option is explicitly passed to serialize(), normalize(), or resolve().