Medium 6.9Published Oct 9, 2026

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

Updated under an hour ago (Oct 27, 2026, 4:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for posit-dev py-shiny

Exploited in the last 30 days

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.

CVSS: 6.9 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

posit-dev py-shiny posit_dev:py_shiny (from the name)	from 1.4.0, < 1.6.4	CNA record

References

References

https://github.com/posit-dev/py-shiny/security/advisories/GHSA-47c3-hpmg-7j6p	x-refsource-confirm
https://github.com/posit-dev/py-shiny/commit/1d8ecb46cbc9621b7dc8812111d26692e086b376	x-refsource-misc
https://github.com/posit-dev/py-shiny/releases/tag/v1.6.4	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.