Withdrawn by the publisher.

Affected: CleanStart: mongosh

Multiple security vulnerabilities affect the mongosh package. These issues are resolved in later releases. See references for individual vulnerability details.

node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.

Affected: npm: tar

### Summary `tar` (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as `C:../../../target.txt`, which enables file overwrite outside `cwd` during normal `tar.x()` extraction.

### Details The extraction logic in `Unpack[STRIPABSOLUTEPATH]` validates `..` segments against a resolved path that still uses the original drive-relative value, and only afterwards rewrites the stored `linkpath` to the stripped value.

What happens with `linkpath: "C:../../../target.txt"`: 1. `stripAbsolutePath()` removes `C:` and rewrites the value to `../../../target.txt`. 2. The escape check resolves using the original pre-stripped value, so it is treated as in-bounds and accepted. 3. Symlink creation uses the rewritten value (`../../../target.txt`) from nested path `a/b/l`. 4. Writing through the extracted symlink overwrites the outside file (`../target.txt`).

This is reachable in standard usage (`tar.x({ cwd, file })`) when extracting attacker-controlled tar archives.

### PoC Tested on Arch Linux with `tar@7.5.10`.

PoC script (`poc.cjs`):

```js const fs = require('fs') const path = require('path') const { Header, x } = require('tar')

const cwd = process.cwd() const target = path.resolve(cwd, '..', 'target.txt') const tarFile = path.join(cwd, 'poc.tar')

fs.writeFileSync(target, 'ORIGINAL\n')

const b = Buffer.alloc(1536) new Header({ path: 'a/b/l', type: 'SymbolicLink', linkpath: 'C:../../../target.t…

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Affected: Ubuntu:Pro:14.04:LTS: node-tar, Ubuntu:Pro:16.04:LTS: node-tar, Ubuntu:18.04:LTS: node-tar, Ubuntu:Pro:20.04:LTS: node-tar, Ubuntu:22.04:LTS: node-tar, Ubuntu:24.04:LTS: node-tar, Ubuntu:25.10: node-tar, Ubuntu:26.04:LTS: node-tar

node-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extraction directory by using a drive-relative symlink target such as C:../../../target.txt, which enables file overwrite outside cwd during normal tar.x() extraction. This vulnerability is fixed in 7.5.11.

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um Dateien zu manipulieren, und um einen Denial of Service Angriff durchzuführen.