https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-10-01T04:39:24.913269+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2026-73620 CVE-2026-73620 — GitPython before 3.1.57 Arbitrary File Overwrite and Read 2026-10-01T04:39:24.915645+00:00

Affected: gitpython-developers GitPython

GitPython before 3.1.57 fails to guard git option forwarding in IndexFile.checkout() and TagReference.create(), allowing attackers to pass unsafe options via kwargs. Attackers can use --prefix to overwrite arbitrary files with repository content or -F to read arbitrary files returned in-band.

 https://vulnerability.circl.lu/vuln/ghsa-3f7w-8rr8-f37f GHSA-3f7w-8rr8-f37f — GitPython: Unguarded git option forwarding in IndexFile.checkout() and TagReference.create() enables arbitrary file ove… 2026-10-01T04:39:24.915785+00:00

Affected: PyPI: GitPython

**Target:** gitpython-developers/GitPython **Tested:** HEAD `07e80555` (2026-07-25), latest release 3.1.55, `git version 2.50.1` **Reported instances:** 2 exploitable, from a sweep of 14 unguarded call sites

## Summary

GitPython blocks dangerous git options through `Git.check_unsafe_options()`, gated per method by an `allow_unsafe_options` parameter. That guard is applied **per call site**, so any API that forwards `**kwargs` into a git command without calling it passes caller-controlled options straight to git.

A mechanical sweep of every method that forwards `**kwargs` into a `.git.<command>(...)` call found **14 sites with no guard**. Two reach a git option that takes a filesystem path:

| # | Call site | git option | Impact | |---|---|---|---| | 1 | `IndexFile.checkout()` → `git checkout-index` | `--prefix=<path>` | arbitrary file **overwrite** with repository-controlled content | | 2 | `TagReference.create()` → `git tag` | `-F <file>` / `--file=<file>` | arbitrary file **read**, returned in-band |

This is the same defect class already fixed in `Commit.count()` (GHSA-p538-c434-8v24), `Repo.archive()` and `Git.ls_remote()` (GHSA-956x-8gvw-wg5v). Both instances below are still present at HEAD.

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## Instance 1 — `IndexFile.checkout()`: arbitrary file overwrite

`git/index/base.py:1210` accepts `**kwargs` and forwards them with no guard:

```python def checkout(self, paths=None, force=False, fprogress=lambda *args: None, **kwargs): ... proc = self.repo.git.ch…

 https://vulnerability.circl.lu/vuln/pysec-2026-3949 PYSEC-2026-3949 2026-10-01T04:39:24.915913+00:00

Affected: PyPI: gitpython

GitPython before 3.1.57 fails to guard git option forwarding in IndexFile.checkout() and TagReference.create(), allowing attackers to pass unsafe options via kwargs. Attackers can use --prefix to overwrite arbitrary files with repository content or -F to read arbitrary files returned in-band.