Interpretation Conflict Affecting fast-uri package, versions <3.1.2
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-16642394
- published12 May 2026
- disclosed5 May 2026
- creditJvr2022
Introduced: 5 May 2026
NewCVE-2026-6322 (opens in a new tab)How to fix?
Upgrade fast-uri to version 3.1.2 or higher.
Overview
fast-uri is a Dependency-free RFC 3986 URI toolbox
Affected versions of this package are vulnerable to Interpretation Conflict during the decoding of URL host component. An attacker can manipulate the authority component of a URI by supplying percent-encoded delimiters, causing the host to be interpreted incorrectly during serialization. This can allow bypassing host allowlist checks, redirect validation, or outbound request routing by steering applications to an unintended authority.