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CVE-2026-108258— Shiny for Python - Path traversal in bookmark restore

Quick assessment

Affected
posit-dev py-shiny
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.

Python 版 Shiny 是一个用于构建交互式 Web 应用的 Python 框架。在版本 1.4.0 至 1.6.4 中，书签恢复功能接受客户端提供的 state_id，并将其直接拼接到服务端 shiny_bookmarks 目录中，而未验证该 state_id 是否仅为单个安全的目录段。攻击者无需认证即可通过父目录引用（如“..”）或绝对路径，使服务器在书签存储已设置为禁用（disable）的情况下，仍读取书签存储目录外的 input.json 和 values.json 文件。此外，在配置了 bookma

CVSS 6.9 · Medium
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I. Basic Information for CVE-2026-108258

Vulnerability Information
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Vulnerability Title
Shiny for Python - Path traversal in bookmark restore
Source: CVE Program / CVE List V5
Vulnerability Description
Shiny for Python is a framework for building interactive web applications in Python. From 1.4.0 until 1.6.4, bookmark restore accepts a client-supplied state_id and joins it into the server-side shiny_bookmarks directory without validating that it is a single safe path segment. An unauthenticated request can use parent-directory segments or an absolute path to make the server open input.json and values.json outside the bookmark store, even when bookmark_store is set to disable. In applications configured with bookmark_store set to server and using ui.input_file(), the restore handler can additionally copy and expose an attacker-selected file from an attacker-selected directory. This issue is fixed in version 1.6.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
posit-dev py-shiny >= 1.4.0, < 1.6.4 -

II. Public POCs for CVE-2026-108258

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III. Intelligence Information for CVE-2026-108258

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Other References for CVE-2026-108258 (3)

IV. Related Vulnerabilities

Same weakness: CWE-22

V. Comments for CVE-2026-108258

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