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CVE-2026-39377— nbconvert has an Arbitrary File Write via Path Traversal in Cell Attachment Filenames

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ExtractAttachmentsPreprocessor对附件文件名清理不当，可能导致任意文件写入。

CVSS 6.5 · Medium EPSS 0.40% · P32
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I. Basic Information for CVE-2026-39377

Vulnerability Information
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Vulnerability Title
nbconvert has an Arbitrary File Write via Path Traversal in Cell Attachment Filenames
Source: CVE Program / CVE List V5
Vulnerability Description
The nbconvert tool, jupyter nbconvert, converts Jupyter notebooks to various other formats via Jinja templates. Versions 6.5 through 7.17.0 allow arbitrary file writes to locations outside the intended output directory when processing notebooks containing crafted cell attachment filenames. The `ExtractAttachmentsPreprocessor` passes attachment filenames directly to the filesystem without sanitization, enabling path traversal attacks. This vulnerability provides complete control over both the destination path and file extension. Version 7.17.1 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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ExtractAttachmentsPreprocessor对附件文件名清理不当，可能导致任意文件写入。
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-2026-39377

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III. Intelligence Information for CVE-2026-39377

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Vendor Pages for CVE-2026-39377 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-39377

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