PYSEC-2026-1603

Vulnerability from pysec - Published: 2026-07-07 16:03 - Updated: 2026-07-07 17:24
VLAI
Details

Versions of the package mammoth from 0.3.25 and before 1.11.0; versions of the package mammoth from 0.3.25 and before 1.11.0; versions of the package mammoth before 1.11.0; versions of the package org.zwobble.mammoth:mammoth before 1.11.0 are vulnerable to Directory Traversal due to the lack of path or file type validation when processing a docx file containing an image with an external link (r:link attribute instead of embedded r:embed). The library resolves the URI to a file path and after reading, the content is encoded as base64 and included in the HTML output as a data URI. An attacker can read arbitrary files on the system where the conversion is performed or cause an excessive resources consumption by crafting a docx file that links to special device files such as /dev/random or /dev/zero.

Severity
9.3 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:H
5.4 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:H/E:P
Impacted products
Name purl
mammoth pkg:pypi/mammoth
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "mammoth",
        "purl": "pkg:pypi/mammoth"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.3.25"
            },
            {
              "fixed": "1.11.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.3.25",
        "0.3.26",
        "0.3.27",
        "0.3.29",
        "0.3.30",
        "0.3.31",
        "1.0.0",
        "1.0.1",
        "1.0.2",
        "1.0.3",
        "1.0.4",
        "1.1.0",
        "1.1.1",
        "1.10.0",
        "1.2.0",
        "1.2.1",
        "1.2.2",
        "1.3.0",
        "1.3.1",
        "1.3.2",
        "1.3.3",
        "1.3.4",
        "1.3.5",
        "1.4.0",
        "1.4.1",
        "1.4.10",
        "1.4.11",
        "1.4.12",
        "1.4.13",
        "1.4.14",
        "1.4.15",
        "1.4.16",
        "1.4.17",
        "1.4.18",
        "1.4.19",
        "1.4.2",
        "1.4.3",
        "1.4.4",
        "1.4.5",
        "1.4.6",
        "1.4.7",
        "1.4.8",
        "1.4.9",
        "1.5.0",
        "1.5.1",
        "1.6.0",
        "1.7.0",
        "1.7.1",
        "1.8.0",
        "1.9.0",
        "1.9.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-11849",
    "GHSA-rmjr-87wv-gf87"
  ],
  "details": "Versions of the package mammoth from 0.3.25 and before 1.11.0; versions of the package mammoth from 0.3.25 and before 1.11.0; versions of the package mammoth before 1.11.0; versions of the package org.zwobble.mammoth:mammoth before 1.11.0 are vulnerable to Directory Traversal due to the lack of path or file type validation when processing a docx file containing an image with an external link (r:link attribute instead of embedded r:embed). The library resolves the URI to a file path and after reading, the content is encoded as base64 and included in the HTML output as a data URI. An attacker can read arbitrary files on the system where the conversion is performed or cause an excessive resources consumption by crafting a docx file that links to special device files such as /dev/random or /dev/zero.",
  "id": "PYSEC-2026-1603",
  "modified": "2026-07-07T17:24:37.784229Z",
  "published": "2026-07-07T16:03:07.843563Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-11849"
    },
    {
      "type": "WEB",
      "url": "https://github.com/mwilliamson/mammoth.js/commit/c54aaeb43a7941317c1f3c119ffa92090f988820"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/AudunWA/4d690d9ae5efdafe7cf71d9c2ee90a10"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mwilliamson/java-mammoth"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-DOTNET-MAMMOTH-13561968"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JAVA-ORGZWOBBLEMAMMOTH-13561969"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-MAMMOTH-13554470"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-PYTHON-MAMMOTH-13561967"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/mammoth"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-rmjr-87wv-gf87"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:H/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Mammoth is vulnerable to Directory Traversal"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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