Impact v3.0.8, v2.1.2, v1.16.4 and below

Patches Has been patched in 3.0.9, 2.1.3, and 1.16.5

Workarounds You can use the ignore option to ignore non files/directories.

js ignore (, header) { // pass files & directories, ignore e.g. symlinks return header.type !== 'file' && header.type !== 'directory' }

Credit Thank you Caleb Brown from Google Open Source Security Team for reporting this in detail.

An Improper Link Resolution Before File Access ("Link Following") and Improper Limitation of a Pathname to a Restricted Directory ("Path Traversal"). This vulnerability occurs when extracting a maliciously crafted tar file, which can result in unauthorized file writes or overwrites outside the intended extraction directory. The issue is associated with index.js in the tar-fs package.

An Improper Link Resolution Before File Access ("Link Following") and Improper Limitation of a Pathname to a Restricted Directory ("Path Traversal"). This vulnerability occurs when extracting a maliciously crafted tar file, which can result in unauthorized file writes or overwrites outside the intended extraction directory. The issue is associated with index.js in the tar-fs package.

This issue affects tar-fs: from 0.0.0 before 1.16.4, from 2.0.0 before 2.1.2, from 3.0.0 before 3.0.8.

Impact v3.1.0, v2.1.3, v1.16.5 and below

Patches Has been patched in 3.1.1, 2.1.4, and 1.16.6

Workarounds You can use the ignore option to ignore non files/directories.

js ignore (, header) { // pass files & directories, ignore e.g. symlinks return header.type !== 'file' && header.type !== 'directory' }

Credit Reported by: Mapta / BugBunnyai

tar-fs provides filesystem bindings for tar-stream. Versions prior to 3.1.1, 2.1.3, and 1.16.5 are vulnerable to symlink validation bypass if the destination directory is predictable with a specific tarball. This issue has been patched in version 3.1.1, 2.1.4, and 1.16.6. A workaround involves using the ignore option on non files/directories.