GHSA-6p8h-3wgx-97gf

Suggest an improvement
Source
https://github.com/advisories/GHSA-6p8h-3wgx-97gf
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6p8h-3wgx-97gf/GHSA-6p8h-3wgx-97gf.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-6p8h-3wgx-97gf
Aliases
Downstream
CGA (16)
CLSA (1)
ECHO (1)
MINI (4)
ROOT (1)
Published
2026-07-24T16:42:09Z
Modified
2026-09-10T13:10:34Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
GitPython: Incomplete unsafe_git_clone_options denylist omits --template enabling arbitrary command execution via clone hooks
Details

Summary

GitPython's unsafe_git_clone_options denylist omits --template. git clone --template=<dir> copies <dir>/hooks/ into the new repository and runs them (post-checkout fires during clone), so a caller who can influence clone options can achieve arbitrary command execution in the default allow_unsafe_options=False configuration.

Root Cause

base.py:145-152 defines unsafe_git_clone_options = ["--upload-pack","-u","--config","-c"] — --template is absent. The guard candidate ['--template'] passes check_unsafe_options (verified). git copies the hook directory and executes post-checkout at checkout time. git's protocol.allow/GIT_ALLOW_PROTOCOL do not gate --template; the incomplete denylist is the only defense.

Impact

Arbitrary OS command execution during clone (default config). Requires an attacker-readable directory containing an executable hook — a genuine second precondition (realistic via shared filesystems, upload dirs, /tmp, or attacker-writable network paths), reflected as AC:H.

Proof of Concept

# attacker stages <dir>/hooks/post-checkout (chmod +x)
from git import Repo
Repo.clone_from(src, dst, template='<dir>')   # post-checkout hook executes -> marker created (verified)

Attack Chain

  1. Setup: attacker stages <dir>/hooks/post-checkout (chmod +x). Guard: n/a (filesystem).
  2. Entry: Repo.clone_from(url, path, template='<dir>'). Guard: check_unsafe_options(candidates=['--template'], unsafe=unsafe_git_clone_options). Bypass proof: --template not on the denylist -> passes (verified candidate ['--template'], no error).
  3. Sink: git copies the hook and executes post-checkout at checkout. Impact: ACE, default config (verified marker created).

Bypass Evidence

Live-verified on HEAD (tag 3.1.53): guard candidate ['--template'] passed with no error; staged post-checkout hook executed during clone_from, creating the marker. Independent of the value-smuggle bypass (--template is a legitimate long option that survives any single-char-value fix). Not covered by any existing advisory.

Affected Versions

<= 3.1.53

Suggested Fix

Add --template (and audit for other hook/exec-influencing options) to unsafe_git_clone_options.

Reported by zx (Jace) — GitHub: @manus-use

Database specific 
{
    "cwe_ids": [
        "CWE-184",
        "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-24T16:42:09Z",
    "nvd_published_at": null,
    "severity": "HIGH"
}
References

Affected packages

PyPI / gitpython

Package

Name
gitpython
View open source insights on deps.dev
Purl
pkg:pypi/gitpython

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.1.54

Affected versions

0.*
0.1.7
0.2.0-beta1
0.3.0-beta1
0.3.0-beta2
0.3.1-beta2
0.3.2.RC1
0.3.2
0.3.2.1
0.3.3
0.3.4
0.3.5
0.3.6
0.3.7
1.*
1.0.0
1.0.1
1.0.2
2.*
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.0.9.dev0
2.0.9.dev1
2.0.9
2.1.0
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.1.8
2.1.9
2.1.10
2.1.11
2.1.12
2.1.13
2.1.14
2.1.15
3.*
3.0.0
3.0.1
3.0.2
3.0.3
3.0.4
3.0.5
3.0.6
3.0.7
3.0.8
3.0.9
3.1.0
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.8
3.1.9
3.1.10
3.1.11
3.1.12
3.1.13
3.1.14
3.1.15
3.1.16
3.1.17
3.1.18
3.1.19
3.1.20
3.1.22
3.1.23
3.1.24
3.1.25
3.1.26
3.1.27
3.1.28
3.1.29
3.1.30
3.1.31
3.1.32
3.1.33
3.1.34
3.1.35
3.1.36
3.1.37
3.1.38
3.1.40
3.1.41
3.1.42
3.1.43
3.1.44
3.1.45
3.1.46
3.1.47
3.1.48
3.1.49
3.1.50
3.1.51
3.1.52
3.1.53

Database specific

last_known_affected_version_range 
"<= 3.1.53"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6p8h-3wgx-97gf/GHSA-6p8h-3wgx-97gf.json"