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CVE-2026-39378— nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding

Quick assessment

Affected
jupyter nbconvert
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.

nbconvert是Jupyter组织的一个格式转换库。将 Jupyter .ipynb 笔记本文档文件转换为另一种静态格式，包括 HTML、LaTeX、PDF、Markdown 等。 nbconvert 6.5版本至7.17.0版本存在路径遍历漏洞，该漏洞源于当HTMLExporter.embed_images=True时，markdown渲染器允许通过图像引用中的路径遍历任意读取文件，可能导致恶意笔记本通过base64数据URI将敏感文件外泄到输出HTML中。

CVSS 6.5 · Medium EPSS 0.46% · P37
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I. Basic Information for CVE-2026-39378

Vulnerability Information
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Vulnerability Title
nbconvert has an Arbitrary File Read via Path Traversal in HTMLExporter Image Embedding
Source: CVE Program / CVE List V5
Vulnerability Description
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. In versions 6.5 through 7.17.0, when `HTMLExporter.embed_images=True`, nbconvert's markdown renderer allows arbitrary file read via path traversal in image references. A malicious notebook can exfiltrate sensitive files from the conversion host by embedding them as base64 data URIs in the output HTML. nbconvert 7.17.1 contains a fix. As a workaround, do not enable `HTMLExporter.embed_images`; it is not enabled by default.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
nbconvert 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nbconvert是Jupyter组织的一个格式转换库。将 Jupyter .ipynb 笔记本文档文件转换为另一种静态格式，包括 HTML、LaTeX、PDF、Markdown 等。 nbconvert 6.5版本至7.17.0版本存在路径遍历漏洞，该漏洞源于当HTMLExporter.embed_images=True时，markdown渲染器允许通过图像引用中的路径遍历任意读取文件，可能导致恶意笔记本通过base64数据URI将敏感文件外泄到输出HTML中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyter nbconvert >= 6.5, < 7.17.1 -

II. Public POCs for CVE-2026-39378

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III. Intelligence Information for CVE-2026-39378

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Vendor Advisories for CVE-2026-39378 (1)

Vendor Pages for CVE-2026-39378 (1)

IV. Related Vulnerabilities

Same product: nbconvert
Same vendor: jupyter
Same weakness: CWE-22

V. Comments for CVE-2026-39378

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