Path Traversal in Mammoth

CVE-2025-11849

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.

Vulnerability class: Path Traversal (Directory Traversal)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.8th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-11849: held from 0.009 to 0.010.

EPSS over last 30 days · oldest: 0.009 · newest: 0.010 · change: +0.001

Affected products

  • Mammoth — versions 0.3.25, 0
  • Org.zwobble.mammoth:mammoth — versions 0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-11849?
CVE-2025-11849 is a critical-severity vulnerability in Mammoth, classified under Path Traversal. CVSS score: 9.3/10. Published 2025-10-17.
How severe is CVE-2025-11849?
Critical severity. CVSS v3 base score is 9.3 out of 10.