GHSA-p538-c434-8v24

Suggest an improvement
Source
https://github.com/advisories/GHSA-p538-c434-8v24
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-p538-c434-8v24/GHSA-p538-c434-8v24.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-p538-c434-8v24
Aliases
Downstream
Published
2026-08-03T20:23:17Z
Modified
2026-09-10T13:10:53Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L CVSS Calculator
Summary
GitPython: Arbitrary file truncation via git rev-list --output argument injection in unguarded Commit.count
Details

Summary

Commit.count() forwards **kwargs into rev_list with no check_unsafe_options guard (the guard exists only in the sibling iter_items, commit.py:341). git rev-list --output=<path> opens and truncates the target file to 0 bytes before revision parsing, so count(output='/victim') destroys/blanks an arbitrary file.

Root Cause

commit.py:290-291 calls self.repo.git.rev_list(self.hexsha, **kwargs) with no check_unsafe_options and no allow_unsafe_options parameter. The sibling iter_items (commit.py:341) is guarded; count is not. This is a distinct, uncovered sink — GHSA-956x-8gvw-wg5v fixed iter_commits/blame, not count.

Impact

Destroy/blank an arbitrary file at process privilege (integrity/availability). Reachability is key-control only (count uses self.hexsha, not a user ref), and the write is a 0-byte truncation (no content control), so MEDIUM.

Proof of Concept

commit.count(output='/path/to/victim')   # victim truncated to 0 bytes (verified)
# control: commit.iter_commits(output=...) raises UnsafeOptionError

Attack Chain

  1. Entry: app forwards user options -> commit.count(output='/victim'). Guard: none. Bypass proof: iter_commits(output=) raises UnsafeOptionError; count(output=) does not — verified side-by-side.
  2. Sink: git rev-list <sha> --output=/victim -> file truncated to 0 bytes. Impact: destroy/blank arbitrary file.

Bypass Evidence

Live-verified on HEAD (tag 3.1.53): count(output=<victim>) truncated a pre-existing file to 0 bytes; guarded iter_commits(output=) raised UnsafeOptionError. Same CNA-accepted "app forwards user options dict" model as GHSA-956x-8gvw-wg5v's archive(**kwargs). Uncovered sink, not a duplicate.

Affected Versions

<= 3.1.53

Suggested Fix

Add check_unsafe_options to Commit.count (mirroring iter_items).

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

Database specific 
{
    "cwe_ids":  [
        "CWE-88"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-08-03T20:23:17Z",
    "nvd_published_at":  null,
    "severity":  "MODERATE"
}
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
3.1.56

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
3.1.54
3.1.55

Database specific

last_known_affected_version_range 
"<= 3.1.55"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-p538-c434-8v24/GHSA-p538-c434-8v24.json"