Vulnerability-Lookup

PYSEC-2026-3843

Vulnerability from pysec - Published: 2026-09-10 09:44 - Updated: 2026-09-10 11:02

Details

Summary

The check_unsafe_options guard can be bypassed on every guarded method (clone/clone_from, fetch/pull/push, ls_remote, iter_commits, blame, archive) by combining a single-character kwarg with split_single_char_options=False. The guard's candidate list omits the smuggled option, but transform_kwarg emits a JOINED -n<value> argv token that git parses as --upload-pack=<cmd>, yielding arbitrary command execution at the default allow_unsafe_options=False. This is an incomplete-fix bypass of commit e8d0fbf7 (the fix for GHSA-r9mr-m37c-5fr3), which only emits value-derived candidates when split_single_char_options is True.

Root Cause

_option_candidates derives value-token candidates only under if len(key)==1 and split_single_char_options: (cmd.py:1048, added by e8d0fbf7). With split_single_char_options=False, _option_candidates([], {"n":"utouch <cmd>;git-upload-pack"}) returns only ['-n'] (not on the denylist), so the guard passes. But transform_kwarg('n', value, split_single_char_options=False) emits the JOINED token -nutouch <cmd>;git-upload-pack (cmd.py:1631). git clusters value-less short flags then parses -u<cmd> = --upload-pack=<cmd> → command execution. The hardened guard WOULD block the joined token if it saw it — the flaw is it never receives it.

Impact

Arbitrary OS command execution as the host process (via --upload-pack) at default allow_unsafe_options=False, affecting all guarded methods that forward kwargs. Precondition: the app forwards a user-controlled kwargs dict containing split_single_char_options=False plus a single-char key (same user-dict-forwarding model GHSA-r9mr-m37c-5fr3 accepts).

Proof of Concept

from git import Repo
Repo.clone_from(src, dst,
    n="utouch /tmp/ACE;git-upload-pack",
    split_single_char_options=False)   # /tmp/ACE created -> ACE

Attack Chain

Entry: app forwards user kwargs to Repo.clone_from(url, path, **kwargs): {split_single_char_options: False, n: 'utouch /tmp/ACE;git-upload-pack'}.
Check: check_unsafe_options(_option_candidates([], kwargs), unsafe_git_clone_options). Guard: denylist includes --upload-pack/-u. Bypass proof: _option_candidates yields only ['-n'] (value token skipped because split=False); guard never sees -u.
Sink: transform_kwarg emits joined token (cmd.py:1631). argv (observed): ['git','clone','-v','-nutouch /tmp/ACE;git-upload-pack','--','<src>','<dst>'].
Impact: git clusters -n + -u<cmd> → runs upload-pack command → ACE.

Bypass Evidence

Independently reproduced (gate harness, default allow_unsafe_options=False): the split=False payload created the marker VH05_GATE_ACE (ACE); the clone returned normally (guard bypassed). Control: n='--upload-pack=…' (split default True) → UnsafeOptionError: --upload-pack is not allowed. Fix-commit read: e8d0fbf7 extends candidates only under if len(key)==1 and split_single_char_options: — split=False skips value emission. Also confirmed the earlier clustering-parse fix (commit 56806080) does not cover this because the guard only ever receives ['-n'].

Affected Versions

GitPython <= 3.1.57 (code present verbatim on the latest release tag).

Suggested Fix

Make _option_candidates emit value-derived candidates regardless of split_single_char_options (i.e. also for the joined -n<value> form), OR run check_unsafe_options over the fully-transformed argv rather than the reconstructed name-only candidate list.

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

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Impacted products

Name	purl
gitpython	pkg:pypi/gitpython

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "gitpython",
        "purl": "pkg:pypi/gitpython"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.58"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.7",
        "0.2.0-beta1",
        "0.3.0-beta1",
        "0.3.0-beta2",
        "0.3.1-beta2",
        "0.3.2",
        "0.3.2.1",
        "0.3.2.RC1",
        "0.3.3",
        "0.3.4",
        "0.3.5",
        "0.3.6",
        "0.3.7",
        "1.0.0",
        "1.0.1",
        "1.0.2",
        "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",
        "2.0.9.dev0",
        "2.0.9.dev1",
        "2.1.0",
        "2.1.1",
        "2.1.10",
        "2.1.11",
        "2.1.12",
        "2.1.13",
        "2.1.14",
        "2.1.15",
        "2.1.2",
        "2.1.3",
        "2.1.4",
        "2.1.5",
        "2.1.6",
        "2.1.7",
        "2.1.8",
        "2.1.9",
        "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",
        "3.1.10",
        "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",
        "3.1.2",
        "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",
        "3.1.3",
        "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",
        "3.1.4",
        "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",
        "3.1.5",
        "3.1.50",
        "3.1.51",
        "3.1.52",
        "3.1.53",
        "3.1.54",
        "3.1.55",
        "3.1.56",
        "3.1.57",
        "3.1.6",
        "3.1.7",
        "3.1.8",
        "3.1.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-76220",
    "GHSA-wvpp-8hx9-p66j"
  ],
  "details": "## Summary\nThe `check_unsafe_options` guard can be bypassed on every guarded method (clone/clone_from, fetch/pull/push, ls_remote, iter_commits, blame, archive) by combining a single-character kwarg with `split_single_char_options=False`. The guard\u0027s candidate list omits the smuggled option, but `transform_kwarg` emits a JOINED `-n\u003cvalue\u003e` argv token that git parses as `--upload-pack=\u003ccmd\u003e`, yielding arbitrary command execution at the default `allow_unsafe_options=False`. This is an incomplete-fix bypass of commit `e8d0fbf7` (the fix for GHSA-r9mr-m37c-5fr3), which only emits value-derived candidates when `split_single_char_options` is True.\n\n## Root Cause\n`_option_candidates` derives value-token candidates only under `if len(key)==1 and split_single_char_options:` (cmd.py:1048, added by `e8d0fbf7`). With `split_single_char_options=False`, `_option_candidates([], {\"n\":\"utouch \u003ccmd\u003e;git-upload-pack\"})` returns only `[\u0027-n\u0027]` (not on the denylist), so the guard passes. But `transform_kwarg(\u0027n\u0027, value, split_single_char_options=False)` emits the JOINED token `-nutouch \u003ccmd\u003e;git-upload-pack` (cmd.py:1631). git clusters value-less short flags then parses `-u\u003ccmd\u003e` = `--upload-pack=\u003ccmd\u003e` \u2192 command execution. The hardened guard WOULD block the joined token if it saw it \u2014 the flaw is it never receives it.\n\n## Impact\nArbitrary OS command execution as the host process (via `--upload-pack`) at default `allow_unsafe_options=False`, affecting all guarded methods that forward kwargs. Precondition: the app forwards a user-controlled kwargs dict containing `split_single_char_options=False` plus a single-char key (same user-dict-forwarding model GHSA-r9mr-m37c-5fr3 accepts).\n\n## Proof of Concept\n```python\nfrom git import Repo\nRepo.clone_from(src, dst,\n    n=\"utouch /tmp/ACE;git-upload-pack\",\n    split_single_char_options=False)   # /tmp/ACE created -\u003e ACE\n```\n\n## Attack Chain\n1. Entry: app forwards user kwargs to `Repo.clone_from(url, path, **kwargs)`: `{split_single_char_options: False, n: \u0027utouch /tmp/ACE;git-upload-pack\u0027}`.\n2. Check: `check_unsafe_options(_option_candidates([], kwargs), unsafe_git_clone_options)`. Guard: denylist includes `--upload-pack`/`-u`. Bypass proof: `_option_candidates` yields only `[\u0027-n\u0027]` (value token skipped because `split=False`); guard never sees `-u`.\n3. Sink: `transform_kwarg` emits joined token (cmd.py:1631). argv (observed): `[\u0027git\u0027,\u0027clone\u0027,\u0027-v\u0027,\u0027-nutouch /tmp/ACE;git-upload-pack\u0027,\u0027--\u0027,\u0027\u003csrc\u003e\u0027,\u0027\u003cdst\u003e\u0027]`.\n4. Impact: git clusters `-n` + `-u\u003ccmd\u003e` \u2192 runs upload-pack command \u2192 ACE.\n\n## Bypass Evidence\nIndependently reproduced (gate harness, default `allow_unsafe_options=False`): the `split=False` payload created the marker `VH05_GATE_ACE` (ACE); the clone returned normally (guard bypassed). Control: `n=\u0027--upload-pack=\u2026\u0027` (split default True) \u2192 `UnsafeOptionError: --upload-pack is not allowed`. Fix-commit read: `e8d0fbf7` extends candidates only under `if len(key)==1 and split_single_char_options:` \u2014 split=False skips value emission. Also confirmed the earlier clustering-parse fix (commit `56806080`) does not cover this because the guard only ever receives `[\u0027-n\u0027]`.\n\n## Affected Versions\n`GitPython \u003c= 3.1.57` (code present verbatim on the latest release tag).\n\n## Suggested Fix\nMake `_option_candidates` emit value-derived candidates regardless of `split_single_char_options` (i.e. also for the joined `-n\u003cvalue\u003e` form), OR run `check_unsafe_options` over the fully-transformed argv rather than the reconstructed name-only candidate list.\n\n---\nReported by **zx (Jace)** \u2014 GitHub: @manus-use",
  "id": "PYSEC-2026-3843",
  "modified": "2026-09-10T11:02:07.652759Z",
  "published": "2026-09-10T09:44:51.423124Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-wvpp-8hx9-p66j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76220"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/pull/2204"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/commit/96a888f4d782cb2f80452148e48e60ce4af6d541"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gitpython-developers/GitPython"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/releases/tag/3.1.58"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/gitpython-before-command-execution-via-split-single-char-options"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/gitpython"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-wvpp-8hx9-p66j"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "GitPython: Unsafe git option guard bypass via split_single_char_options=False short-option token smuggling enables command execution"
}

CVE-2026-76220 (GCVE-0-2026-76220)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:02 – Updated: 2026-08-20 18:30

Title

GitPython before 3.1.58 Command Execution via split_single_char_options

Summary

GitPython before 3.1.58 contains a command execution vulnerability in the check_unsafe_options guard that can be bypassed by combining a single-character kwarg with split_single_char_options=False. Attackers can supply a crafted kwargs dictionary to guarded methods like clone_from to emit a joined token parsed as --upload-pack, enabling arbitrary OS command execution at default allow_unsafe_options=False.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-20 03:56 UTC

CWE

CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/gitpython-developers/GitPython…	vendor-advisory
https://www.vulncheck.com/advisories/gitpython-be…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
gitpython-developers	GitPython	Affected: 0 , < 3.1.58 (semver) Unaffected: 3.1.58 (semver) cpe:2.3:a:gitpython_project:gitpython::::::::

Date Public

2026-08-04 00:00

Credits

manus-use

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-76220",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-20T03:56:32.878302Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-20T18:30:07.927Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/GitPython",
          "product": "GitPython",
          "vendor": "gitpython-developers",
          "versions": [
            {
              "lessThan": "3.1.58",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "3.1.58",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:gitpython_project:gitpython:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.1.58",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "manus-use"
        }
      ],
      "datePublic": "2026-08-04T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "GitPython before 3.1.58 contains a command execution vulnerability in the check_unsafe_options guard that can be bypassed by combining a single-character kwarg with split_single_char_options=False. Attackers can supply a crafted kwargs dictionary to guarded methods like clone_from to emit a joined token parsed as --upload-pack, enabling arbitrary OS command execution at default allow_unsafe_options=False."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-88",
              "description": "Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T14:02:04.108Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-wvpp-8hx9-p66j)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-wvpp-8hx9-p66j"
        },
        {
          "name": "VulnCheck Advisory: GitPython before 3.1.58 Command Execution via split_single_char_options",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/gitpython-before-command-execution-via-split-single-char-options"
        }
      ],
      "title": "GitPython before 3.1.58 Command Execution via split_single_char_options",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-76220",
    "datePublished": "2026-08-19T14:02:04.108Z",
    "dateReserved": "2026-08-19T11:35:13.689Z",
    "dateUpdated": "2026-08-20T18:30:07.927Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

GHSA-WVPP-8HX9-P66J

Vulnerability from github – Published: 2026-08-07 15:49 – Updated: 2026-09-08 20:54

Summary

GitPython: Unsafe git option guard bypass via split_single_char_options=False short-option token smuggling enables command execution

Details

Summary

Root Cause

Impact

Proof of Concept

from git import Repo
Repo.clone_from(src, dst,
    n="utouch /tmp/ACE;git-upload-pack",
    split_single_char_options=False)   # /tmp/ACE created -> ACE

Attack Chain

Entry: app forwards user kwargs to Repo.clone_from(url, path, **kwargs): {split_single_char_options: False, n: 'utouch /tmp/ACE;git-upload-pack'}.
Check: check_unsafe_options(_option_candidates([], kwargs), unsafe_git_clone_options). Guard: denylist includes --upload-pack/-u. Bypass proof: _option_candidates yields only ['-n'] (value token skipped because split=False); guard never sees -u.
Sink: transform_kwarg emits joined token (cmd.py:1631). argv (observed): ['git','clone','-v','-nutouch /tmp/ACE;git-upload-pack','--','<src>','<dst>'].
Impact: git clusters -n + -u<cmd> → runs upload-pack command → ACE.

Bypass Evidence

Affected Versions

GitPython <= 3.1.57 (code present verbatim on the latest release tag).

Suggested Fix

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

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.1.57"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "GitPython"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.58"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-76220"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-88"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-07T15:49:07Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\nThe `check_unsafe_options` guard can be bypassed on every guarded method (clone/clone_from, fetch/pull/push, ls_remote, iter_commits, blame, archive) by combining a single-character kwarg with `split_single_char_options=False`. The guard\u0027s candidate list omits the smuggled option, but `transform_kwarg` emits a JOINED `-n\u003cvalue\u003e` argv token that git parses as `--upload-pack=\u003ccmd\u003e`, yielding arbitrary command execution at the default `allow_unsafe_options=False`. This is an incomplete-fix bypass of commit `e8d0fbf7` (the fix for GHSA-r9mr-m37c-5fr3), which only emits value-derived candidates when `split_single_char_options` is True.\n\n## Root Cause\n`_option_candidates` derives value-token candidates only under `if len(key)==1 and split_single_char_options:` (cmd.py:1048, added by `e8d0fbf7`). With `split_single_char_options=False`, `_option_candidates([], {\"n\":\"utouch \u003ccmd\u003e;git-upload-pack\"})` returns only `[\u0027-n\u0027]` (not on the denylist), so the guard passes. But `transform_kwarg(\u0027n\u0027, value, split_single_char_options=False)` emits the JOINED token `-nutouch \u003ccmd\u003e;git-upload-pack` (cmd.py:1631). git clusters value-less short flags then parses `-u\u003ccmd\u003e` = `--upload-pack=\u003ccmd\u003e` \u2192 command execution. The hardened guard WOULD block the joined token if it saw it \u2014 the flaw is it never receives it.\n\n## Impact\nArbitrary OS command execution as the host process (via `--upload-pack`) at default `allow_unsafe_options=False`, affecting all guarded methods that forward kwargs. Precondition: the app forwards a user-controlled kwargs dict containing `split_single_char_options=False` plus a single-char key (same user-dict-forwarding model GHSA-r9mr-m37c-5fr3 accepts).\n\n## Proof of Concept\n```python\nfrom git import Repo\nRepo.clone_from(src, dst,\n    n=\"utouch /tmp/ACE;git-upload-pack\",\n    split_single_char_options=False)   # /tmp/ACE created -\u003e ACE\n```\n\n## Attack Chain\n1. Entry: app forwards user kwargs to `Repo.clone_from(url, path, **kwargs)`: `{split_single_char_options: False, n: \u0027utouch /tmp/ACE;git-upload-pack\u0027}`.\n2. Check: `check_unsafe_options(_option_candidates([], kwargs), unsafe_git_clone_options)`. Guard: denylist includes `--upload-pack`/`-u`. Bypass proof: `_option_candidates` yields only `[\u0027-n\u0027]` (value token skipped because `split=False`); guard never sees `-u`.\n3. Sink: `transform_kwarg` emits joined token (cmd.py:1631). argv (observed): `[\u0027git\u0027,\u0027clone\u0027,\u0027-v\u0027,\u0027-nutouch /tmp/ACE;git-upload-pack\u0027,\u0027--\u0027,\u0027\u003csrc\u003e\u0027,\u0027\u003cdst\u003e\u0027]`.\n4. Impact: git clusters `-n` + `-u\u003ccmd\u003e` \u2192 runs upload-pack command \u2192 ACE.\n\n## Bypass Evidence\nIndependently reproduced (gate harness, default `allow_unsafe_options=False`): the `split=False` payload created the marker `VH05_GATE_ACE` (ACE); the clone returned normally (guard bypassed). Control: `n=\u0027--upload-pack=\u2026\u0027` (split default True) \u2192 `UnsafeOptionError: --upload-pack is not allowed`. Fix-commit read: `e8d0fbf7` extends candidates only under `if len(key)==1 and split_single_char_options:` \u2014 split=False skips value emission. Also confirmed the earlier clustering-parse fix (commit `56806080`) does not cover this because the guard only ever receives `[\u0027-n\u0027]`.\n\n## Affected Versions\n`GitPython \u003c= 3.1.57` (code present verbatim on the latest release tag).\n\n## Suggested Fix\nMake `_option_candidates` emit value-derived candidates regardless of `split_single_char_options` (i.e. also for the joined `-n\u003cvalue\u003e` form), OR run `check_unsafe_options` over the fully-transformed argv rather than the reconstructed name-only candidate list.\n\n---\nReported by **zx (Jace)** \u2014 GitHub: @manus-use",
  "id": "GHSA-wvpp-8hx9-p66j",
  "modified": "2026-09-08T20:54:56Z",
  "published": "2026-08-07T15:49:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-wvpp-8hx9-p66j"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76220"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/pull/2204"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/commit/96a888f4d782cb2f80452148e48e60ce4af6d541"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gitpython-developers/GitPython"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/releases/tag/3.1.58"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/gitpython-before-command-execution-via-split-single-char-options"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "GitPython: Unsafe git option guard bypass via split_single_char_options=False short-option token smuggling enables command execution"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

PYSEC-2026-3843

Summary

Root Cause

Impact

Proof of Concept

Attack Chain

Bypass Evidence

Affected Versions

Suggested Fix

CVE-2026-76220 (GCVE-0-2026-76220)

GHSA-WVPP-8HX9-P66J

Summary

Root Cause

Impact

Proof of Concept

Attack Chain

Bypass Evidence

Affected Versions

Suggested Fix

Tags

Sightings

Nomenclature