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CVE-2025-71399 is a path normalization bypass vulnerability affecting Better Auth versions prior to 1.4.5 through its dependency chain on better-call and the rou3 router library. In vulnerable rou3 versions, URL paths are normalized by removing empty path segments, causing variants such as a canonical path and the same path with repeated slashes to resolve to the same route. This behavior can create a mismatch between path-based security controls and route resolution in Better Auth, allowing requests crafted with extra slashes to evade disabledPaths enforcement and path-based rate limiting. The issue is fixed in Better Auth 1.4.5, which bundles a corrected rou3 version.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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