KITFORMA · EDITORIAL GUIDE
How can I extract an uploaded ZIP without allowing paths outside its destination?
KitForma editorial guide. Archive member names are input data, not trusted filesystem paths. Absolute paths, parent traversal and platform-specific separators require validation before writing.
Step-by-step guidance
Archive member names are input data, not trusted filesystem paths. Absolute paths, parent traversal and platform-specific separators require validation before writing.
Resolve each intended destination beneath a dedicated extraction root and reject any member escaping it. Also bound entry count, uncompressed size and compression ratio, and decide explicitly whether links are allowed. Test harmless fixtures containing
../outside.txt, absolute names and oversized declared sizes. Do not assume path checks alone prevent archive bombs or overwrite races. Use a maintained extraction library, an isolated temporary directory and a policy that refuses unexpected file types before moving verified output into permanent storage.Sources and verification
Sources checked:
Scope: This editorial guide is based on the cited sources and tool behavior. A forum question or a query observed for our site does not establish market search volume, low competition, guaranteed rankings or inadequate answers elsewhere.
This starter guide was prepared by KitForma with AI assistance. It is not presented as a real member question or an independent user review. Check the sources and the result with your own file; report corrections in the discussion.