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bdu:2026-01029

2026-10-09T08:08:16.901671+00:00

bdu:2026-01029

BREW-pnpm-CVE-2026-24056 — pnpm has symlink traversal in file:/git dependencies

2026-10-09T08:08:16.901707+00:00

Affected: Homebrew: pnpm

pnpm is a package manager. Prior to version 10.28.2, when pnpm installs a `file:` (directory) or `git:` dependency, it follows symlinks and reads their target contents without constraining them to the package root. A malicious package containing a symlink to an absolute path (e.g., `/etc/passwd`, `~/.ssh/id_rsa`) causes pnpm to copy that file's contents into `node_modules`, leaking local data. The vulnerability only affects `file:` and `git:` dependencies. Registry packages (npm) have symlinks stripped during publish and are NOT affected. The issue impacts developers installing local/file dependencies andCI/CD pipelines installing git dependencies. It can lead to credential theft via symlinks to `~/.aws/credentials`, `~/.npmrc`, `~/.ssh/id_rsa`. Version 10.28.2 contains a patch.

EUVD-2026-266759

2026-10-09T08:08:16.901745+00:00

EUVD-2026-266759

fkie_cve-2026-24056

2026-10-09T08:08:16.901759+00:00

GHSA-m733-5w8f-5ggw — pnpm has symlink traversal in file:/git dependencies

2026-10-09T08:08:16.901785+00:00

Affected: npm: pnpm

### Summary When pnpm installs a `file:` (directory) or `git:` dependency, it follows symlinks and reads their target contents without constraining them to the package root. A malicious package containing a symlink to an absolute path (e.g., `/etc/passwd`, `~/.ssh/id_rsa`) causes pnpm to copy that file's contents into `node_modules`, leaking local data.

**Preconditions:** Only affects `file:` and `git:` dependencies. Registry packages (npm) have symlinks stripped during publish and are NOT affected.

### Details The vulnerability exists in `store/cafs/src/addFilesFromDir.ts`. The code uses `fs.statSync()` and `readFileSync()` which follow symlinks by default:

```typescript const absolutePath = path.join(dirname, relativePath) const stat = fs.statSync(absolutePath) // Follows symlinks! const buffer = fs.readFileSync(absolutePath) // Reads symlink TARGET ```

There is no check that `absolutePath` resolves to a location inside the package directory.

### PoC ```bash # Create malicious package mkdir -p /tmp/evil && cd /tmp/evil ln -s /etc/passwd leaked-passwd.txt echo '{"name":"evil","version":"1.0.0","files":["*.txt"]}' > package.json

# Victim installs mkdir /tmp/victim && cd /tmp/victim pnpm init && pnpm add file:../evil

# Leaked! cat node_modules/evil/leaked-passwd.txt ```

### Impact - Developers installing local/file dependencies - CI/CD pipelines installing git dependencies - Credential theft via symlinks to `~/.aws/credentials`, `~/.npmrc`, `~/.ssh/id_rsa`

### Sugg…