CVE-2025-11849Public exploitNetwork attack vector

Host file disclosure via external image links

Published Oct 17, 2025 · Updated Oct 17, 2025

Path traversal in Michael Williamson Mammoth before 1.11.0 allows attackers to read host files through crafted DOCX images. The DOCX relationship reader treats an external image r:link target as a file URI, reads it without path or type validation, and embeds the bytes as a base64 data URI in generated HTML. Exploitation requires a consuming application or operator to convert the crafted document; special-device targets can also exhaust resources and hang or crash the conversion process.

CVSS severityUnavailable
Unscored
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Michael Williamson Mammoth before 1.11.0 allows attackers to read host files through crafted DOCX images. The DOCX relationship reader treats an external image r:link target as a file URI, reads it without path or type validation, and embeds the bytes as a base64 data URI in generated HTML. Exploitation requires a consuming application or operator to convert the crafted document; special-device targets can also exhaust resources and hang or crash the conversion process.

The record

CVE
CVE-2025-11849
Published
Oct 17, 2025
Updated
Oct 17, 2025
Vendor
Michael Williamson
Product
Mammoth
Classifications
CWE-22, T1499.004, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.11.0
  2. Affected versionversion=0.3.25 <1.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Michael Williamson · Mammothversion=0 <1.11.0; version=0.3.25 <1.11.0

Published CVSS scores

5.4GitHub Advisory DatabaseCVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1499.004Application or System Exploitation
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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