GHSA-6PX9-J4QR-XFJW

Vulnerability from github – Published: 2026-03-05 00:32 – Updated: 2026-03-09 15:49
VLAI?
Summary
pyLoad has an Arbitrary File Write via Path Traversal in edit_package()
Details

The edit_package() function implements insufficient sanitization for the pack_folder parameter. The current protection relies on a single-pass string replacement of "../", which can be bypassed using crafted recursive traversal sequences.

Exploitation

An authenticated user with MODIFY permission can bypass the sanitization by submitting a payload such as: pack_folder=..././..././..././tmp

After the single-pass replacement, this becomes: ../../../tmp

Because the traversal sequences are not properly validated, the resulting normalized path escapes the intended storage directory and writes files to /tmp or other locations.

Severity ?
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyload-ng"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.5.0b3.dev13"
            },
            {
              "last_affected": "0.5.0b3.dev96"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29778"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-23"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-05T00:32:19Z",
    "nvd_published_at": "2026-03-07T16:15:54Z",
    "severity": "HIGH"
  },
  "details": "The edit_package() function implements insufficient sanitization for the pack_folder parameter. The current protection relies on a single-pass string replacement of \"../\", which can be bypassed using crafted recursive traversal sequences.\n\nExploitation\n\nAn authenticated user with MODIFY permission can bypass the sanitization by submitting a payload such as:\n`pack_folder=..././..././..././tmp`\n\nAfter the single-pass replacement, this becomes:\n`../../../tmp`\n\nBecause the traversal sequences are not properly validated, the resulting normalized path escapes the intended storage directory and writes files to /tmp or other locations.",
  "id": "GHSA-6px9-j4qr-xfjw",
  "modified": "2026-03-09T15:49:37Z",
  "published": "2026-03-05T00:32:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyload/pyload/security/advisories/GHSA-6px9-j4qr-xfjw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29778"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pyload/pyload"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pyLoad has an Arbitrary File Write via Path Traversal in edit_package()"
}


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