CVE-2026-114140 Jupyter nbconvert - Path Traversal

Jupyter nbconvert 5.4.0 to < 7.17.2 contains a path traversal caused by improper sanitization of output metadata filenames in ExtractOutputPreprocessor, letting attackers write files to arbitrary locations during notebook conversion, exploit requires victim to convert a malicious notebook.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Path Traversal
Impact
Data Tampering
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-22

Vendor fix

Upgrade to version 7.17.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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