A path traversal vulnerability exists in filepath.Clean on Windows. On Windows, the filepath.Clean function could transform an invalid path such as "a/../c:/b" into the valid path "c:\b". This transformation of a relative (if invalid) path into an absolute path could enable a directory traversal attack. After fix, the filepath.Clean function transforms this path into the relative (but still invalid) path ".\c:\b".

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-41722
• https://go.dev/cl/468123
• https://go.dev/issue/57274
• https://groups.google.com/g/golang-announce/c/V0aBFqaFs_E
• https://pkg.go.dev/vuln/GO-2023-1568