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High severity7.5NVD Advisory· Published May 5, 2026· Updated May 12, 2026

CVE-2026-6322

CVE-2026-6322

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
fast-urinpm
< 3.1.23.1.2

Affected products

55

Patches

Vulnerability mechanics

References

4

News mentions

0

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