CVE-2025-11849 — Vulnerability in org.zwobble.mammoth:mammoth —...
MEDIUM
Mammoth is vulnerable to Directory Traversal
Published October 17, 2025Updated July 7, 2026Source: osv
Summary
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.
Advisory Timeline
- First published October 17, 2025 (360 days ago).
- Last revised July 7, 2026 — 263 days after initial publication.
Remediation
Upgrade to the fixed version using your package manager.
Maven
Update org.zwobble.mammoth:mammoth to 1.11.0 or later<!-- Update pom.xml dependency version to 1.11.0 for org.zwobble.mammoth:mammoth -->
pip
Update mammoth to 1.11.0 or laterpip install "mammoth>=1.11.0"
NuGet
Update Mammoth to 1.11.0 or laterdotnet add package Mammoth --version 1.11.0
npm
Update mammoth to 1.11.0 or laternpm install mammoth@1.11.0
After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.
Affected Packages (4)
Affects 4 ecosystems: maven (1), npm (1), nuget (1), pypi (1).
| Package | Ecosystem | Affected | Fixed In |
|---|---|---|---|
| org.zwobble.mammoth:mammoth | maven | 0.0.1, 0.0.2, 0.0.3, 0.0.4 (+10 more) | 1.11.0 |
| mammoth | pypi | 0.3.25, 0.3.26, 0.3.27, 0.3.29 (+47 more) | 1.11.0 |
| Mammoth | nuget | 0.0.1, 0.0.2, 1.3.1, 1.3.2 (+2 more) | 1.11.0 |
| mammoth | npm | All versions | 1.11.0 |
Vulnerability Classification
Common Weakness Enumeration (CWE) identifiers for this vulnerability type.
- CWE-22Path TraversalMITRE
CVSS Score Breakdown
What the CVSS (Common Vulnerability Scoring System) 9.3 score means for each attack dimension.
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:H
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-11849ADVISORY
- https://github.com/mwilliamson/mammoth.js/commit/c54aaeb43a7941317c1f3c119ffa92090f988820WEB
- https://gist.github.com/AudunWA/4d690d9ae5efdafe7cf71d9c2ee90a10WEB
- https://github.com/mwilliamson/java-mammothPACKAGE
- https://security.snyk.io/vuln/SNYK-DOTNET-MAMMOTH-13561968WEB
- https://security.snyk.io/vuln/SNYK-JAVA-ORGZWOBBLEMAMMOTH-13561969WEB
- https://security.snyk.io/vuln/SNYK-JS-MAMMOTH-13554470WEB
- https://security.snyk.io/vuln/SNYK-PYTHON-MAMMOTH-13561967WEB
Frequently Asked Questions
- What is CVE-2025-11849?
- Mammoth is vulnerable to Directory Traversal This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 9.3/10).
- How do I check if my project is affected by CVE-2025-11849?
- CVE-2025-11849 affects org.zwobble.mammoth:mammoth, mammoth and Mammoth. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-11849 and 200,000+ other known vulnerabilities.
Severity & Exploitability
CVSS Score
9.3
Exploitation is straightforward and causes maximum impact. Patch immediately.
Also Known As
GHSA-rmjr-87wv-gf87
PYSEC-2026-1603
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