AIKIDO-2026-398140
compressing is vulnerable to Path Traversal
53
Medium Risk
This Affects:
compressingTL;DR
The archive extraction in compressing validates each entry's destination with a recursive symlink walk in lib/utils.js before writing extracted files. The dangling-symlink branch of that check inspects only the first hop of a symlink chain, so a pre-existing multi-hop chain whose first hop stays inside the extraction root while a later hop points outside is treated as safe. Extracting a crafted tar, tgz, or zip archive into a directory seeded with such a chain then creates attacker-controlled files outside the extraction root. The fix fully resolves and validates every hop of the chain, removes destination symlinks, and opens targets with O_NOFOLLOW where available.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and extract archives into a directory whose contents can be influenced by untrusted input.
Background info
compressing is vulnerable to Path Traversal in versions 0.0.1 - 1.10.5 and 2.0.0 - 2.1.1.
How to fix this
Upgrade the compressing library to the patch version.
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