# GitPython: Unguarded git option forwarding in Repo.init enables arbitrary command execution via --template clone hooks

Advisory record · `GHSA-9rj7-rf2p-w77r`

- **Identifiers:** `GHSA-9rj7-rf2p-w77r` · `CVE-2026-76218` · `PYSEC-2026-3840`
- **State:** Confirmed
- **Severity:** CVSS 7.7 High
- **Critical:** No
- **Weakness (CWE):** [CWE-88](https://cwe.mitre.org/data/definitions/88.html) · [CWE-94](https://cwe.mitre.org/data/definitions/94.html)
- **Tags:** [Command injection](https://agentprime.io/advisories/tag/command-injection.md) · [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Published:** 7 Aug 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Aug 2026, 15:36 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `gitpython` (PyPI): affected `<3.1.58`; fixed in `3.1.58`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> GitPython versions before 3.1.58 are vulnerable. Repo.init() passes keyword arguments straight to git init without checking for unsafe options, so a template argument can install hooks that run on later git operations. An attacker who can supply that argument and place a hook directory at a known path could get arbitrary code execution with the host process's privileges. Upgrade to GitPython 3.1.58 or later.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.7 High, CVSS 4.0: `CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`, from CNA (VulnCheck)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0072, the 54th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:10 UTC: First seen by agentprime
- 31 Oct 2026, 14:10 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-9rj7-rf2p-w77r)

## Sources

- [GitHub Advisory Database: GHSA-9rj7-rf2p-w77r](https://github.com/advisories/GHSA-9rj7-rf2p-w77r)
- [OSV: GHSA-9rj7-rf2p-w77r](https://osv.dev/vulnerability/GHSA-9rj7-rf2p-w77r)
- <https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-9rj7-rf2p-w77r>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-76218>
- <https://github.com/gitpython-developers/GitPython/pull/2204>
- <https://github.com/gitpython-developers/GitPython/commit/d9ddb55bdc66>
- <https://github.com/gitpython-developers/GitPython>
- <https://github.com/gitpython-developers/GitPython/releases/tag/3.1.58>
- <https://www.vulncheck.com/advisories/gitpython-before-remote-code-execution-via-repo-init>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-9rj7-rf2p-w77r>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-9rj7-rf2p-w77r/>. Everything for agents: <https://agentprime.io/llms.txt>.