EUVD-2026-27129
GHSA-q3j6-qgpj-74h6
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
Path normalization bypass in fast-uri 3.1.0 and earlier allows remote attackers to circumvent path-based access controls through percent-encoded path traversal sequences. The normalize() and equal() functions decode URL-encoded separators (%2F) and dot segments (%2E) before applying normalization rules, causing distinct URIs to collapse onto identical normalized paths. …
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RemediationAI
Within 24 hours: identify all applications and services using fast-uri library and document current versions. Within 7 days: upgrade fast-uri to version 3.1.1 or later across all affected systems; validate upgrade in non-production environments first. …
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