CVE-2026-29790: Path Traversal Commonprefix
Use of `os.path.commonprefix` for path validation is insecure. `commonprefix` performs a character-by-character comparison rather than comparing path components. This allows path traversal to sibling directories that share the same string prefix as the intended destination directory. Use `os.path.commonpath` instead.
Pythongreprules fetch cve-2026-29790-path-traversal-commonprefix --engine opengrepDescription
Use of `os.path.commonprefix` for path validation is insecure. `commonprefix` performs a character-by-character comparison rather than comparing path components. This allows path traversal to sibling directories that share the same string prefix as the intended destination directory. Use `os.path.commonpath` instead.
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