Vulnerability-Lookup

GHSA-WP53-J4WJ-2CFG

Vulnerability from github – Published: 2026-01-26 23:28 – Updated: 2026-01-26 23:28

Summary

Python-Multipart has Arbitrary File Write via Non-Default Configuration

Details

Summary

A Path Traversal vulnerability exists when using non-default configuration options UPLOAD_DIR and UPLOAD_KEEP_FILENAME=True. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename.

Details

When UPLOAD_DIR is set and UPLOAD_KEEP_FILENAME is True, the library constructs the file path using os.path.join(file_dir, fname). Due to the behavior of os.path.join(), if the filename begins with a /, all preceding path components are discarded:

os.path.join("/upload/dir", "/etc/malicious") == "/etc/malicious"

This allows an attacker to bypass the intended upload directory and write files to arbitrary paths.

Affected Configuration

Projects are only affected if all of the following are true:
- UPLOAD_DIR is set - UPLOAD_KEEP_FILENAME is set to True - The uploaded file exceeds MAX_MEMORY_FILE_SIZE (triggering a flush to disk)

The default configuration is not vulnerable.

Impact

Arbitrary file write to attacker-controlled paths on the filesystem.

Mitigation

Upgrade to version 0.0.22, or avoid using UPLOAD_KEEP_FILENAME=True in project configurations.

Severity ?

8.6 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "python-multipart"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-24486"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-26T23:28:05Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nA Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename.\n\n### Details\n\nWhen `UPLOAD_DIR` is set and `UPLOAD_KEEP_FILENAME` is `True`, the library constructs the file path using `os.path.join(file_dir, fname)`. Due to the behavior of `os.path.join()`, if the filename begins with a `/`, all preceding path components are discarded:\n\n```py\nos.path.join(\"/upload/dir\", \"/etc/malicious\") == \"/etc/malicious\"\n```\n                        \nThis allows an attacker to bypass the intended upload directory and write files to arbitrary paths.                                         \n                                                                                                                                              \n#### Affected Configuration                                                                                                                      \n                                                                                                                                              \nProjects are only affected if all of the following are true:                                                                                     \n- `UPLOAD_DIR` is set\n- `UPLOAD_KEEP_FILENAME` is set to True\n- The uploaded file exceeds `MAX_MEMORY_FILE_SIZE` (triggering a flush to disk)\n\nThe default configuration is not vulnerable.                                                                                                \n                                                                                                                                              \n#### Impact                                                                                                                                   \n                                                                                                                                              \nArbitrary file write to attacker-controlled paths on the filesystem.                                                                        \n                                                                                                                                              \n#### Mitigation                                                                                                                                  \n                                                                                                                                              \nUpgrade to version 0.0.22, or avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations.",
  "id": "GHSA-wp53-j4wj-2cfg",
  "modified": "2026-01-26T23:28:05Z",
  "published": "2026-01-26T23:28:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Kludex/python-multipart/security/advisories/GHSA-wp53-j4wj-2cfg"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Kludex/python-multipart/commit/9433f4bbc9652bdde82bbe380984e32f8cfc89c4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Kludex/python-multipart"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Kludex/python-multipart/releases/tag/0.0.22"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Python-Multipart has Arbitrary File Write via Non-Default Configuration"
}

CVE-2026-24486 (GCVE-0-2026-24486)

Vulnerability from cvelistv5 – Published: 2026-01-27 00:34 – Updated: 2026-01-27 00:34

Title

Python-Multipart has Arbitrary File Write via Non-Default Configuration

Summary

Python-Multipart is a streaming multipart parser for Python. Prior to version 0.0.22, a Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename. Users should upgrade to version 0.0.22 to receive a patch or, as a workaround, avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations.

Severity ?

8.6 (High)


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

CWE

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

Assigner

GitHub_M

References

URL

Tags

	https://github.com/Kludex/python-multipart/securi…	x_refsource_CONFIRM
	https://github.com/Kludex/python-multipart/commit…	x_refsource_MISC
	https://github.com/Kludex/python-multipart/releas…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	Kludex	python-multipart	Affected: < 0.0.22

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "python-multipart",
          "vendor": "Kludex",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.0.22"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Python-Multipart is a streaming multipart parser for Python. Prior to version 0.0.22, a Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename. Users should upgrade to version 0.0.22 to receive a patch or, as a workaround, avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L",
            "version": "3.1"
          }
        }
      ],
      "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": "2026-01-27T00:34:06.229Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Kludex/python-multipart/security/advisories/GHSA-wp53-j4wj-2cfg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Kludex/python-multipart/security/advisories/GHSA-wp53-j4wj-2cfg"
        },
        {
          "name": "https://github.com/Kludex/python-multipart/commit/9433f4bbc9652bdde82bbe380984e32f8cfc89c4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Kludex/python-multipart/commit/9433f4bbc9652bdde82bbe380984e32f8cfc89c4"
        },
        {
          "name": "https://github.com/Kludex/python-multipart/releases/tag/0.0.22",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Kludex/python-multipart/releases/tag/0.0.22"
        }
      ],
      "source": {
        "advisory": "GHSA-wp53-j4wj-2cfg",
        "discovery": "UNKNOWN"
      },
      "title": "Python-Multipart has Arbitrary File Write via Non-Default Configuration"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-24486",
    "datePublished": "2026-01-27T00:34:06.229Z",
    "dateReserved": "2026-01-23T00:38:20.548Z",
    "dateUpdated": "2026-01-27T00:34:06.229Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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

GHSA-WP53-J4WJ-2CFG

Summary

Details

Affected Configuration

Impact

Mitigation

CVE-2026-24486 (GCVE-0-2026-24486)

Tags

Sightings

Nomenclature