Vulnerability Details CVE-2026-6321
fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions. Encoded path data was treated like real slashes and parent-directory references, so distinct URIs could collapse onto the same normalized path. Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed, with a path that appears confined under an allowed prefix normalizing to a different location. Versions <= 3.1.0 are affected. Update to 3.1.1 or later.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 16.9%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-6321
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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