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CVE-2026-97151

Quick assessment

Affected
mwilliamson mammoth.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mammoth（又名 mammoth.js）在版本 1.12.2 之前存在原型污染漏洞，该漏洞出现在处理文档中定义的样式时。攻击者可以通过构造恶意的 .docx 文件，将任意属性添加到 中。在版本 1.11.0 至 1.12.1 中，如果在同一进程中继续转换其他文档并返回转换后的 HTML，应用程序还可能通过设置 为 ，将本地服务器文件的内容泄露给提供这些文档的一方。

CVSS 8.4 · High EPSS 0.36% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
mwilliamson mammoth.js < 1.12.2 affected
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I. Basic Information for CVE-2026-97151

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
mammoth (aka mammoth.js) before 1.12.2 is vulnerable to prototype pollution when reading the styles defined in a document. Converting a crafted .docx file allows an attacker to add arbitrary properties to Object.prototype. In 1.11.0 through 1.12.1, applications that convert further documents in the same process and return the converted HTML can also disclose the contents of local server files (to the party supplying the documents) by setting externalFileAccess to true.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mwilliamson mammoth.js 0 ~ 1.12.2 -

II. Public POCs for CVE-2026-97151

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III. Intelligence Information for CVE-2026-97151

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Patches & Fixes for CVE-2026-97151 (2)

Other References for CVE-2026-97151 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1321

V. Comments for CVE-2026-97151

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