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Vulnerabilities CVE-2026-6322

CVE-2026-6322

High
Open
TLP:CLEAR

fast-uri vulnerable to host confusion via percent-encoded authority delimiters

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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.

Details

CVSS Score
7.5
EPSS Score
0.48%

38.8th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Confidence
90%
Published
May 5, 2026
Last Modified
Aug 12, 2026
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