Vulnerability-Lookup

PYSEC-2026-2890

Vulnerability from pysec - Published: 2026-07-13 15:02 - Updated: 2026-07-13 16:05

Details

Summary

The extractall() function in src/poetry/utils/helpers.py:410-426 extracts sdist tarballs without path traversal protection on Python versions where tarfile.data_filter is unavailable. Considering only Python versions which are still supported by Poetry, these are 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4.

Impact

Arbitrary file write (path traversal) from untrusted sdist content.

In practice, the impact is low because an attacker who exploits this vulnerability can as well include arbitrary code in a setup.py, which will be executed when the sdist is built after tar extraction. In other words, a malicious sdist can write arbitrary files by design. However, since it is unexpected and not by design that the file write already happens during tar extraction, this is still considered a vulnerability.

On Python 3.11.2 (Debian Bookworm default, directly tested), a crafted sdist with ../../ tar member paths writes files outside the intended extraction directory. The traversal occurs during metadata resolution (poetry add --lock), before the build backend is run.

Affected Environments: - Python 3.10.0 through 3.10.12 (inclusive): tarfile.data_filter absent or broken - Python 3.11.0 through 3.11.4 (inclusive): tarfile.data_filter absent or broken - Debian Bookworm: Python 3.11.2 (default) - Ubuntu 22.04 LTS: Python 3.10.6 (default)

Patches

Versions 2.3.4 and newer of Poetry ensure that paths are inside the target directory.

Root Cause

File: src/poetry/utils/helpers.py, lines 410-426:

def extractall(source: Path, dest: Path, zip: bool) -> None:
    """Extract all members from either a zip or tar archive."""
    if zip:
        with zipfile.ZipFile(source) as archive:
            archive.extractall(dest)
    else:
        broken_tarfile_filter = {(3, 9, 17), (3, 10, 12), (3, 11, 4)}
        with tarfile.open(source) as archive:
            if (
                hasattr(tarfile, "data_filter")
                and sys.version_info[:3] not in broken_tarfile_filter
            ):
                archive.extractall(dest, filter="data")
            else:
                archive.extractall(dest)  # <-- NO FILTER: path traversal

On Python versions without a working tarfile.data_filter, the else branch at line 426 calls tarfile.extractall() without any filter or path validation. This enables three attack vectors:

Direct path traversal: Tar members with ../../ path components write files outside the extraction directory.
Symlink traversal: A symlink member pointing outside dest, followed by a file written through that symlink, escapes the boundary.
Hardlink attacks: Hardlink members can read arbitrary files (same inode) or overwrite targets outside dest.

Call Sites

This function is called from two locations:

src/poetry/installation/chef.py:104 (_prepare_sdist): During poetry install / poetry add when building a package from sdist. Only triggered when the executor is enabled (actual installation).
src/poetry/inspection/info.py:322 (_from_sdist_file): During dependency resolution (poetry lock / poetry add). This path is reached when the sdist's PKG-INFO lacks Requires-Dist metadata, forcing Poetry to extract the archive (and afterwards build the package).

Suggested Fix

Apply path validation in the else branch, covering direct traversal, symlinks, and hardlinks:

def extractall(source: Path, dest: Path, zip: bool) -> None:
    """Extract all members from either a zip or tar archive."""
    if zip:
        with zipfile.ZipFile(source) as archive:
            archive.extractall(dest)
    else:
        broken_tarfile_filter = {(3, 9, 17), (3, 10, 12), (3, 11, 4)}
        with tarfile.open(source) as archive:
            if (
                hasattr(tarfile, "data_filter")
                and sys.version_info[:3] not in broken_tarfile_filter
            ):
                archive.extractall(dest, filter="data")
            else:
                # Validate all member paths before extraction
                dest_resolved = dest.resolve()
                safe_members = []
                for member in archive.getmembers():
                    member_path = (dest_resolved / member.name).resolve()
                    if not member_path.is_relative_to(dest_resolved):
                        raise ValueError(
                            f"Refusing to extract {member.name}: "
                            f"would write outside {dest}"
                        )
                    if member.issym():
                        link_target = (member_path.parent / member.linkname).resolve()
                        if not link_target.is_relative_to(dest_resolved):
                            raise ValueError(
                                f"Refusing symlink {member.name}: "
                                f"target {member.linkname} outside {dest}"
                            )
                    elif member.islnk():
                        link_target = (dest_resolved / member.linkname).resolve()
                        if not link_target.is_relative_to(dest_resolved):
                            raise ValueError(
                                f"Refusing hardlink {member.name}: "
                                f"target {member.linkname} outside {dest}"
                            )
                    safe_members.append(member)
                archive.extractall(dest, members=safe_members)

Severity

0.6 (Low)


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

Impacted products

Name	purl
poetry	pkg:pypi/poetry

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "poetry",
        "purl": "pkg:pypi/poetry"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.10.0",
        "0.10.0a0",
        "0.10.0a1",
        "0.10.0a2",
        "0.10.0a3",
        "0.10.1",
        "0.10.2",
        "0.10.3",
        "0.11.0",
        "0.11.0a0",
        "0.11.0a1",
        "0.11.0a2",
        "0.11.0a3",
        "0.11.0a4",
        "0.11.1",
        "0.11.2",
        "0.11.3",
        "0.11.4",
        "0.11.5",
        "0.12.0",
        "0.12.0a0",
        "0.12.0a1",
        "0.12.0a2",
        "0.12.0a3",
        "0.12.0a4",
        "0.12.0a5",
        "0.12.1",
        "0.12.10",
        "0.12.11",
        "0.12.12",
        "0.12.13",
        "0.12.14",
        "0.12.15",
        "0.12.16",
        "0.12.17",
        "0.12.2",
        "0.12.3",
        "0.12.4",
        "0.12.5",
        "0.12.6",
        "0.12.7",
        "0.12.8",
        "0.12.9",
        "0.2.0",
        "0.3.0",
        "0.4.0",
        "0.4.0.post1",
        "0.4.1",
        "0.4.2",
        "0.5.0",
        "0.5.0b1",
        "0.5.0b2",
        "0.6.0",
        "0.6.1",
        "0.6.2",
        "0.6.3",
        "0.6.3b1",
        "0.6.3b2",
        "0.6.3b3",
        "0.6.3b4",
        "0.6.3b5",
        "0.6.3b6",
        "0.6.3b7",
        "0.6.4",
        "0.6.4b1",
        "0.6.5",
        "0.7.0",
        "0.7.0b1",
        "0.7.0b2",
        "0.7.0b3",
        "0.7.0b4",
        "0.7.1",
        "0.8.0",
        "0.8.0a0",
        "0.8.0a1",
        "0.8.0a2",
        "0.8.0a3",
        "0.8.0a4",
        "0.8.1",
        "0.8.1a0",
        "0.8.2",
        "0.8.3",
        "0.8.4",
        "0.8.5",
        "0.8.5a0",
        "0.8.6",
        "0.9.0",
        "0.9.0a0",
        "0.9.0a1",
        "0.9.0a2",
        "0.9.0a3",
        "0.9.1",
        "1.0.0",
        "1.0.0a0",
        "1.0.0a1",
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        "1.0.0a3",
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        "1.0.0a5",
        "1.0.0b1",
        "1.0.0b2",
        "1.0.0b3",
        "1.0.0b4",
        "1.0.0b5",
        "1.0.0b6",
        "1.0.0b7",
        "1.0.0b8",
        "1.0.0b9",
        "1.0.1",
        "1.0.10",
        "1.0.2",
        "1.0.3",
        "1.0.4",
        "1.0.5",
        "1.0.6",
        "1.0.7",
        "1.0.8",
        "1.0.9",
        "1.1.0",
        "1.1.0a1",
        "1.1.0a2",
        "1.1.0a3",
        "1.1.0b1",
        "1.1.0b2",
        "1.1.0b3",
        "1.1.0b4",
        "1.1.0rc1",
        "1.1.1",
        "1.1.10",
        "1.1.11",
        "1.1.12",
        "1.1.13",
        "1.1.14",
        "1.1.15",
        "1.1.2",
        "1.1.3",
        "1.1.4",
        "1.1.5",
        "1.1.6",
        "1.1.7",
        "1.1.8",
        "1.1.9",
        "1.2.0",
        "1.2.0a1",
        "1.2.0a2",
        "1.2.0b1",
        "1.2.0b2",
        "1.2.0b3",
        "1.2.0rc1",
        "1.2.0rc2",
        "1.2.1",
        "1.2.2",
        "1.3.0",
        "1.3.1",
        "1.3.2",
        "1.4.0",
        "1.4.1",
        "1.4.2",
        "1.5.0",
        "1.5.1",
        "1.6.0",
        "1.6.1",
        "1.7.0",
        "1.7.1",
        "1.8.0",
        "1.8.1",
        "1.8.2",
        "1.8.3",
        "1.8.4",
        "1.8.5",
        "2.0.0",
        "2.0.1",
        "2.1.0",
        "2.1.1",
        "2.1.2",
        "2.1.3",
        "2.1.4",
        "2.2.0",
        "2.2.1",
        "2.3.0",
        "2.3.1",
        "2.3.2",
        "2.3.3"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41140",
    "GHSA-73h3-mf4w-8647"
  ],
  "details": "### Summary\n\nThe `extractall()` function in `src/poetry/utils/helpers.py:410-426` extracts sdist tarballs without path traversal protection on Python versions where `tarfile.data_filter` is unavailable. Considering only Python versions which are still supported by Poetry, these are 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4.\n\n### Impact\n\nArbitrary file write (path traversal) from untrusted sdist content.\n\n**In practice, the impact is low** because an attacker who exploits this vulnerability can as well include arbitrary code in a `setup.py`, which will be executed when the sdist is built after tar extraction. In other words, a malicious sdist can write arbitrary files by design. However, since it is unexpected and not by design that the file write already happens during tar extraction, this is still considered a vulnerability.\n\nOn Python 3.11.2 (Debian Bookworm default, directly tested), a crafted sdist with `../../` tar member paths writes files outside the intended extraction directory. The traversal occurs during metadata resolution (`poetry add --lock`), before the build backend is run.\n\nAffected Environments: \n- **Python 3.10.0 through 3.10.12** (inclusive): `tarfile.data_filter` absent or broken\n- **Python 3.11.0 through 3.11.4** (inclusive): `tarfile.data_filter` absent or broken\n- **Debian Bookworm**: Python 3.11.2 (default)\n- **Ubuntu 22.04 LTS**: Python 3.10.6 (default)\n\n### Patches\n\nVersions 2.3.4 and newer of Poetry ensure that paths are inside the target directory.\n\n### Root Cause\n\nFile: `src/poetry/utils/helpers.py`, lines 410-426:\n\n```python\ndef extractall(source: Path, dest: Path, zip: bool) -\u003e None:\n    \"\"\"Extract all members from either a zip or tar archive.\"\"\"\n    if zip:\n        with zipfile.ZipFile(source) as archive:\n            archive.extractall(dest)\n    else:\n        broken_tarfile_filter = {(3, 9, 17), (3, 10, 12), (3, 11, 4)}\n        with tarfile.open(source) as archive:\n            if (\n                hasattr(tarfile, \"data_filter\")\n                and sys.version_info[:3] not in broken_tarfile_filter\n            ):\n                archive.extractall(dest, filter=\"data\")\n            else:\n                archive.extractall(dest)  # \u003c-- NO FILTER: path traversal\n```\n\nOn Python versions without a working `tarfile.data_filter`, the `else` branch at line 426 calls `tarfile.extractall()` without any filter or path validation. This enables three attack vectors:\n\n1. **Direct path traversal**: Tar members with `../../` path components write files outside the extraction directory.\n2. **Symlink traversal**: A symlink member pointing outside dest, followed by a file written through that symlink, escapes the boundary.\n3. **Hardlink attacks**: Hardlink members can read arbitrary files (same inode) or overwrite targets outside dest.\n\n#### Call Sites\n\nThis function is called from two locations:\n\n1. **`src/poetry/installation/chef.py:104`** (`_prepare_sdist`): During `poetry install` / `poetry add` when building a package from sdist. Only triggered when the executor is enabled (actual installation).\n\n2. **`src/poetry/inspection/info.py:322`** (`_from_sdist_file`): During dependency resolution (`poetry lock` / `poetry add`). This path is reached when the sdist\u0027s `PKG-INFO` lacks `Requires-Dist` metadata, forcing Poetry to extract the archive (and afterwards build the package).\n\n### Suggested Fix\n\nApply path validation in the `else` branch, covering direct traversal, symlinks, and hardlinks:\n\n```python\ndef extractall(source: Path, dest: Path, zip: bool) -\u003e None:\n    \"\"\"Extract all members from either a zip or tar archive.\"\"\"\n    if zip:\n        with zipfile.ZipFile(source) as archive:\n            archive.extractall(dest)\n    else:\n        broken_tarfile_filter = {(3, 9, 17), (3, 10, 12), (3, 11, 4)}\n        with tarfile.open(source) as archive:\n            if (\n                hasattr(tarfile, \"data_filter\")\n                and sys.version_info[:3] not in broken_tarfile_filter\n            ):\n                archive.extractall(dest, filter=\"data\")\n            else:\n                # Validate all member paths before extraction\n                dest_resolved = dest.resolve()\n                safe_members = []\n                for member in archive.getmembers():\n                    member_path = (dest_resolved / member.name).resolve()\n                    if not member_path.is_relative_to(dest_resolved):\n                        raise ValueError(\n                            f\"Refusing to extract {member.name}: \"\n                            f\"would write outside {dest}\"\n                        )\n                    if member.issym():\n                        link_target = (member_path.parent / member.linkname).resolve()\n                        if not link_target.is_relative_to(dest_resolved):\n                            raise ValueError(\n                                f\"Refusing symlink {member.name}: \"\n                                f\"target {member.linkname} outside {dest}\"\n                            )\n                    elif member.islnk():\n                        link_target = (dest_resolved / member.linkname).resolve()\n                        if not link_target.is_relative_to(dest_resolved):\n                            raise ValueError(\n                                f\"Refusing hardlink {member.name}: \"\n                                f\"target {member.linkname} outside {dest}\"\n                            )\n                    safe_members.append(member)\n                archive.extractall(dest, members=safe_members)\n```",
  "id": "PYSEC-2026-2890",
  "modified": "2026-07-13T16:05:36.936329Z",
  "published": "2026-07-13T15:02:52.466566Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/python-poetry/poetry/security/advisories/GHSA-73h3-mf4w-8647"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41140"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/python-poetry/poetry"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python-poetry/poetry/releases/tag/2.3.4"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/poetry"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-73h3-mf4w-8647"
    }
  ],
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Poetry has Path Traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4"
}

BREW-POETRY-CVE-2026-41140 (CVE-2026-41140)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:28 – Updated: 2026-10-07 22:45 – Source website

Summary

Poetry: Path traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4

Details

Poetry is a dependency manager for Python. Prior to 2.3.4, the extractall() function in src/poetry/utils/helpers.py:410-426 extracts sdist tarballs without path traversal protection on Python versions where tarfile.data_filter is unavailable. Considering only Python versions which are still supported by Poetry, these are 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4. This vulnerability is fixed in 2.3.4.

Severity

0.6 (Low)


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

References

URL

Type

	https://security.access.redhat.com/data/csaf/v2/v…	WEB
	https://access.redhat.com/errata/RHSA-2026:24866	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-41140	ADVISORY
	https://github.com/CVEProject/cvelistV5/tree/main…	ADVISORY
	https://github.com/python-poetry/poetry/security/…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-41140	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2461604	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "2.3.4"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "poetry",
        "purl": "pkg:brew/poetry"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "2.3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "git",
    "upstream_evidence": [
      {
        "ecosystem": "GIT",
        "key": "https://github.com/python-poetry/poetry",
        "name": "https://github.com/python-poetry/poetry",
        "strategy": "git",
        "subject_version": "2.5.1"
      },
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/poetry@2.5.1",
        "name": "poetry",
        "strategy": "registry",
        "subject_version": "2.5.1"
      },
      {
        "ecosystem": "Debian",
        "key": "Debian/poetry",
        "name": "poetry",
        "strategy": "distro"
      },
      {
        "ecosystem": "GIT",
        "key": "upstream:https://github.com/python-poetry/poetry",
        "name": "https://github.com/python-poetry/poetry",
        "strategy": "distro",
        "subject_version": "2.5.1"
      },
      {
        "ecosystem": "PyPI",
        "key": "upstream:pkg:pypi/poetry@2.5.1",
        "name": "poetry",
        "strategy": "distro",
        "subject_version": "2.5.1"
      },
      {
        "ecosystem": "Ubuntu",
        "key": "Ubuntu/poetry",
        "name": "poetry",
        "strategy": "distro"
      }
    ]
  },
  "details": "Poetry is a dependency manager for Python. Prior to 2.3.4, the extractall() function in src/poetry/utils/helpers.py:410-426 extracts sdist tarballs without path traversal protection on Python versions where tarfile.data_filter is unavailable. Considering only Python versions which are still supported by Poetry, these are 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4. This vulnerability is fixed in 2.3.4.",
  "id": "BREW-poetry-CVE-2026-41140",
  "modified": "2026-10-07T22:45:43Z",
  "published": "2026-08-13T17:28:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41140.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:24866"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-41140"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41140.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/python-poetry/poetry/security/advisories/GHSA-73h3-mf4w-8647"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41140"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461604"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Poetry: Path traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4",
  "upstream": [
    "CVE-2026-41140",
    "GHSA-73h3-mf4w-8647",
    "PYSEC-2026-2890"
  ]
}

CVE-2026-41140 (GCVE-0-2026-41140)

Vulnerability from cvelistv5 – Published: 2026-04-24 17:10 – Updated: 2026-07-15 00:59

Title

Poetry: Path traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4

Summary

Severity

0.6 (Low)


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

8.7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-24 18:02 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7851 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/python-poetry/poetry/security/…	x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-41140	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2461604	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:24866	vendor-advisoryx_refsource_REDHAT

Impacted products

7 products

Vendor	Product	Version
python-poetry	poetry	Affected: < 2.3.4
Red Hat	Red Hat Ansible Automation Platform 2.6	Unaffected: 1779761061 , < * (rpm) cpe:/a:redhat:ansible_automation_platform:2.6::el9
Red Hat	Red Hat Ansible Automation Platform 2.6	Unaffected: 1780102732 , < * (rpm) cpe:/a:redhat:ansible_automation_platform:2.6::el9
Red Hat	Red Hat Ansible Automation Platform 2	cpe:/a:redhat:ansible_automation_platform:2
Red Hat	Red Hat OpenShift AI (RHOAI)	cpe:/a:redhat:openshift_ai
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4
Red Hat	Red Hat Satellite 6	cpe:/a:redhat:satellite:6

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GHSA-73H3-MF4W-8647

Vulnerability from github – Published: 2026-04-22 14:35 – Updated: 2026-04-27 16:41

Summary

Poetry has Path Traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4

Details

Summary

Impact

Arbitrary file write (path traversal) from untrusted sdist content.

Patches

Versions 2.3.4 and newer of Poetry ensure that paths are inside the target directory.

Root Cause

File: src/poetry/utils/helpers.py, lines 410-426:

def extractall(source: Path, dest: Path, zip: bool) -> None:
    """Extract all members from either a zip or tar archive."""
    if zip:
        with zipfile.ZipFile(source) as archive:
            archive.extractall(dest)
    else:
        broken_tarfile_filter = {(3, 9, 17), (3, 10, 12), (3, 11, 4)}
        with tarfile.open(source) as archive:
            if (
                hasattr(tarfile, "data_filter")
                and sys.version_info[:3] not in broken_tarfile_filter
            ):
                archive.extractall(dest, filter="data")
            else:
                archive.extractall(dest)  # <-- NO FILTER: path traversal

On Python versions without a working tarfile.data_filter, the else branch at line 426 calls tarfile.extractall() without any filter or path validation. This enables three attack vectors:

Direct path traversal: Tar members with ../../ path components write files outside the extraction directory.
Symlink traversal: A symlink member pointing outside dest, followed by a file written through that symlink, escapes the boundary.
Hardlink attacks: Hardlink members can read arbitrary files (same inode) or overwrite targets outside dest.

Call Sites

This function is called from two locations:

src/poetry/installation/chef.py:104 (_prepare_sdist): During poetry install / poetry add when building a package from sdist. Only triggered when the executor is enabled (actual installation).
src/poetry/inspection/info.py:322 (_from_sdist_file): During dependency resolution (poetry lock / poetry add). This path is reached when the sdist's PKG-INFO lacks Requires-Dist metadata, forcing Poetry to extract the archive (and afterwards build the package).

Suggested Fix

Apply path validation in the else branch, covering direct traversal, symlinks, and hardlinks:

def extractall(source: Path, dest: Path, zip: bool) -> None:
    """Extract all members from either a zip or tar archive."""
    if zip:
        with zipfile.ZipFile(source) as archive:
            archive.extractall(dest)
    else:
        broken_tarfile_filter = {(3, 9, 17), (3, 10, 12), (3, 11, 4)}
        with tarfile.open(source) as archive:
            if (
                hasattr(tarfile, "data_filter")
                and sys.version_info[:3] not in broken_tarfile_filter
            ):
                archive.extractall(dest, filter="data")
            else:
                # Validate all member paths before extraction
                dest_resolved = dest.resolve()
                safe_members = []
                for member in archive.getmembers():
                    member_path = (dest_resolved / member.name).resolve()
                    if not member_path.is_relative_to(dest_resolved):
                        raise ValueError(
                            f"Refusing to extract {member.name}: "
                            f"would write outside {dest}"
                        )
                    if member.issym():
                        link_target = (member_path.parent / member.linkname).resolve()
                        if not link_target.is_relative_to(dest_resolved):
                            raise ValueError(
                                f"Refusing symlink {member.name}: "
                                f"target {member.linkname} outside {dest}"
                            )
                    elif member.islnk():
                        link_target = (dest_resolved / member.linkname).resolve()
                        if not link_target.is_relative_to(dest_resolved):
                            raise ValueError(
                                f"Refusing hardlink {member.name}: "
                                f"target {member.linkname} outside {dest}"
                            )
                    safe_members.append(member)
                archive.extractall(dest, members=safe_members)

Severity

0.6 (Low)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "poetry"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41140"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-22T14:35:30Z",
    "nvd_published_at": "2026-04-24T18:16:28Z",
    "severity": "LOW"
  },
  "details": "### Summary\n\nThe `extractall()` function in `src/poetry/utils/helpers.py:410-426` extracts sdist tarballs without path traversal protection on Python versions where `tarfile.data_filter` is unavailable. Considering only Python versions which are still supported by Poetry, these are 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4.\n\n### Impact\n\nArbitrary file write (path traversal) from untrusted sdist content.\n\n**In practice, the impact is low** because an attacker who exploits this vulnerability can as well include arbitrary code in a `setup.py`, which will be executed when the sdist is built after tar extraction. In other words, a malicious sdist can write arbitrary files by design. However, since it is unexpected and not by design that the file write already happens during tar extraction, this is still considered a vulnerability.\n\nOn Python 3.11.2 (Debian Bookworm default, directly tested), a crafted sdist with `../../` tar member paths writes files outside the intended extraction directory. The traversal occurs during metadata resolution (`poetry add --lock`), before the build backend is run.\n\nAffected Environments: \n- **Python 3.10.0 through 3.10.12** (inclusive): `tarfile.data_filter` absent or broken\n- **Python 3.11.0 through 3.11.4** (inclusive): `tarfile.data_filter` absent or broken\n- **Debian Bookworm**: Python 3.11.2 (default)\n- **Ubuntu 22.04 LTS**: Python 3.10.6 (default)\n\n### Patches\n\nVersions 2.3.4 and newer of Poetry ensure that paths are inside the target directory.\n\n### Root Cause\n\nFile: `src/poetry/utils/helpers.py`, lines 410-426:\n\n```python\ndef extractall(source: Path, dest: Path, zip: bool) -\u003e None:\n    \"\"\"Extract all members from either a zip or tar archive.\"\"\"\n    if zip:\n        with zipfile.ZipFile(source) as archive:\n            archive.extractall(dest)\n    else:\n        broken_tarfile_filter = {(3, 9, 17), (3, 10, 12), (3, 11, 4)}\n        with tarfile.open(source) as archive:\n            if (\n                hasattr(tarfile, \"data_filter\")\n                and sys.version_info[:3] not in broken_tarfile_filter\n            ):\n                archive.extractall(dest, filter=\"data\")\n            else:\n                archive.extractall(dest)  # \u003c-- NO FILTER: path traversal\n```\n\nOn Python versions without a working `tarfile.data_filter`, the `else` branch at line 426 calls `tarfile.extractall()` without any filter or path validation. This enables three attack vectors:\n\n1. **Direct path traversal**: Tar members with `../../` path components write files outside the extraction directory.\n2. **Symlink traversal**: A symlink member pointing outside dest, followed by a file written through that symlink, escapes the boundary.\n3. **Hardlink attacks**: Hardlink members can read arbitrary files (same inode) or overwrite targets outside dest.\n\n#### Call Sites\n\nThis function is called from two locations:\n\n1. **`src/poetry/installation/chef.py:104`** (`_prepare_sdist`): During `poetry install` / `poetry add` when building a package from sdist. Only triggered when the executor is enabled (actual installation).\n\n2. **`src/poetry/inspection/info.py:322`** (`_from_sdist_file`): During dependency resolution (`poetry lock` / `poetry add`). This path is reached when the sdist\u0027s `PKG-INFO` lacks `Requires-Dist` metadata, forcing Poetry to extract the archive (and afterwards build the package).\n\n### Suggested Fix\n\nApply path validation in the `else` branch, covering direct traversal, symlinks, and hardlinks:\n\n```python\ndef extractall(source: Path, dest: Path, zip: bool) -\u003e None:\n    \"\"\"Extract all members from either a zip or tar archive.\"\"\"\n    if zip:\n        with zipfile.ZipFile(source) as archive:\n            archive.extractall(dest)\n    else:\n        broken_tarfile_filter = {(3, 9, 17), (3, 10, 12), (3, 11, 4)}\n        with tarfile.open(source) as archive:\n            if (\n                hasattr(tarfile, \"data_filter\")\n                and sys.version_info[:3] not in broken_tarfile_filter\n            ):\n                archive.extractall(dest, filter=\"data\")\n            else:\n                # Validate all member paths before extraction\n                dest_resolved = dest.resolve()\n                safe_members = []\n                for member in archive.getmembers():\n                    member_path = (dest_resolved / member.name).resolve()\n                    if not member_path.is_relative_to(dest_resolved):\n                        raise ValueError(\n                            f\"Refusing to extract {member.name}: \"\n                            f\"would write outside {dest}\"\n                        )\n                    if member.issym():\n                        link_target = (member_path.parent / member.linkname).resolve()\n                        if not link_target.is_relative_to(dest_resolved):\n                            raise ValueError(\n                                f\"Refusing symlink {member.name}: \"\n                                f\"target {member.linkname} outside {dest}\"\n                            )\n                    elif member.islnk():\n                        link_target = (dest_resolved / member.linkname).resolve()\n                        if not link_target.is_relative_to(dest_resolved):\n                            raise ValueError(\n                                f\"Refusing hardlink {member.name}: \"\n                                f\"target {member.linkname} outside {dest}\"\n                            )\n                    safe_members.append(member)\n                archive.extractall(dest, members=safe_members)\n```",
  "id": "GHSA-73h3-mf4w-8647",
  "modified": "2026-04-27T16:41:39Z",
  "published": "2026-04-22T14:35:30Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/python-poetry/poetry/security/advisories/GHSA-73h3-mf4w-8647"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41140"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/python-poetry/poetry"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python-poetry/poetry/releases/tag/2.3.4"
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  "schema_version": "1.4.0",
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      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Poetry has Path Traversal in tar extraction on Python 3.10.0 - 3.10.12 and 3.11.0 - 3.11.4"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

PYSEC-2026-2890

Summary

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Suggested Fix

BREW-POETRY-CVE-2026-41140 (CVE-2026-41140)

CVE-2026-41140 (GCVE-0-2026-41140)

GHSA-73H3-MF4W-8647

Summary

Impact

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Suggested Fix

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Nomenclature

Vulnerability timeline

Related by attack behaviour