Vulnerability Details 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. 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 1.5%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-6322
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cpe:2.3:a:openjsf:fast-uri:0.0.1
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cpe:2.3:a:openjsf:fast-uri:0.0.2
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cpe:2.3:a:openjsf:fast-uri:1.0.0
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cpe:2.3:a:openjsf:fast-uri:1.0.1
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cpe:2.3:a:openjsf:fast-uri:2.0.0
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cpe:2.3:a:openjsf:fast-uri:2.1.0
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cpe:2.3:a:openjsf:fast-uri:2.2.0
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cpe:2.3:a:openjsf:fast-uri:2.3.0
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cpe:2.3:a:openjsf:fast-uri:2.3.1
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cpe:2.3:a:openjsf:fast-uri:2.4.0
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cpe:2.3:a:openjsf:fast-uri:3.0.0
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cpe:2.3:a:openjsf:fast-uri:3.0.1
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cpe:2.3:a:openjsf:fast-uri:3.0.2
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cpe:2.3:a:openjsf:fast-uri:3.0.3
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cpe:2.3:a:openjsf:fast-uri:3.0.4
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cpe:2.3:a:openjsf:fast-uri:3.0.5
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cpe:2.3:a:openjsf:fast-uri:3.0.6
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cpe:2.3:a:openjsf:fast-uri:3.1.0
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cpe:2.3:a:openjsf:fast-uri:3.1.1