NetSight
IP …
high7.5

CVE-2026-6322

fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization.

Impact

fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator, changing the URI's authority to the second domain. Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the input appeared to specify. Versions <= 3.1.1 are affected. Update to 3.1.2 or later.

Affected packages

EcosystemPackageAffectedFixed in
npmfast-uri>= 3.0.0, <= 3.1.13.1.2

Affected products

VendorProductAffected versions
OpenjsfFast-Uri
before 3.1.2

Weakness classification

CWE-140CWE-436

References