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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 affected rou3 versions, URL paths are normalized by removing empty path segments, causing variants such as a single-slash path and equivalent paths containing multiple consecutive slashes to resolve to the same route. This behavior can cause Better Auth path-based security controls to be evaluated inconsistently, allowing requests crafted with extra slashes to bypass disabledPaths restrictions 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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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.