CVE-2025-11849 json
Mammoth is vulnerable to Directory Traversal
published 2025-10-17 12 mo ago modified 2026-10-19 21 d ago also GHSA-rmjr-87wv-gf87 , PYSEC-2026-1603 , EUVD-2025-34861
- cvss
- 9.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 66%
- public exploits
- 0
- none known
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.
Patch / fix
- npm mammoth 1.11.0
- maven org.zwobble.mammoth:mammoth 1.11.0
- pypi mammoth 1.11.0
- nuget Mammoth 1.11.0
- n/a mammoth 1.11.0
- n/a org.zwobble.mammoth:mammoth 1.11.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 12 mo ago
Exploit prediction
1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gist.github.com https://gist.github.com/AudunWA/4d690d9ae5efdafe7cf71d9c2ee90a10 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.4 | 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 |
| CNA | 3.1 | 9.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:H/E:P |
| CNA | 4.0 | 5.4 | 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| CNA | 3.1 | 9.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:H |
| GitHub | 3.1 | 9.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:H |
| OSV | 3.1 | 9.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | mammoth | >=0.3.25, <1.11.0 |
1.11.0 |
| maven | org.zwobble.mammoth:mammoth | <1.11.0 |
1.11.0 |
| pypi | mammoth | >=0.3.25, <1.11.0 |
1.11.0 |
| nuget | Mammoth | <1.11.0 |
1.11.0 |
Affected products
- n/a mammoth
- n/a org.zwobble.mammoth:mammoth
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
github.com
/mwilliamson/mammoth.js/commit/c54aaeb43a7941317c1f3c119ffa92090f988820
web
-
gist.github.com
/AudunWA/4d690d9ae5efdafe7cf71d9c2ee90a10
exploit, web
-
security.snyk.io
/vuln/SNYK-JS-MAMMOTH-13554470
web
-
security.snyk.io
/vuln/SNYK-PYTHON-MAMMOTH-13561967
web
-
security.snyk.io
/vuln/SNYK-DOTNET-MAMMOTH-13561968
web
-
security.snyk.io
/vuln/SNYK-JAVA-ORGZWOBBLEMAMMOTH-13561969
web
-
nvd.nist.gov
/vuln/detail/CVE-2025-11849
advisory
-
github.com
/mwilliamson/java-mammoth
package
-
pypi.org
/project/mammoth
package
-
github.com
/advisories/GHSA-rmjr-87wv-gf87
advisory
Sources
- CVE List CVE-2025-11849
- GitHub Advisory GHSA-rmjr-87wv-gf87
- NVD CVE-2025-11849
- OSV PYSEC-2026-1603
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