TI-2026-86013 Aliases CVE-2026-123854 GHSA-p2w8-wjxp-vp5p

Code execution in JetBrains PyCharm Safe Mode via crafted notebook widget

LOW 26CWE-829Published 2026-11-06 · Updated 2026-11-08

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-829.

Summary

JetBrains PyCharm before 2026.3 contains an untrusted functionality inclusion flaw (CWE-829) in its Jupyter notebook support. A crafted Jupyter notebook widget module can execute code even when Safe Mode is enabled. The source description does not state what the attacker must do beyond supplying the crafted module, and the CVSS vector indicates local access with user interaction and high confidentiality impact.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

In JetBrains PyCharm before 2026.3 code execution was possible in Safe Mode via a crafted Jupyter notebook widget module

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00169 6th percentileScored 2026-11-07

Fix Fixed PyCharm (JetBrains): 2026.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
JetBrains	PyCharm	before 2026.3	2026.3	Patch available	CNA

PyCharm VendorJetBrains Affected before 2026.3 Fixed in 2026.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:jetbrains:pycharm::::::::	—	—	JetBrains

cpe:2.3:a:jetbrains:pycharm:*:*:*:*:*:*:*:* Versions — — ·JetBrains

Remediation

Update JetBrains PyCharm to version 2026.3 or later, which fixes this flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA PyCharm (JetBrains) Fixed in 2026.3

Timeline

2026-11-06 Threatist record created from CVE-2026-123854
2026-11-06 CISA SSVC decision points changed
2026-11-06 Priority changed: MEDIUM → LOW
2026-11-06 Alias added: GHSA-p2w8-wjxp-vp5p
2026-11-07 CISA SSVC decision points changed
2026-11-08 CISA SSVC decision points changed

References

Other 1

https://www.jetbrains.com/privacy-security/issues-fixed/

TI-2026-45031 Deserialization of untrusted data in JetBrains TeamCity KEVCVSS 3.1CRITICAL 9.8
TI-2024-18053 In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possible KEVCVSS 3.1CRITICAL 9.8
TI-2023-22884 In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible KEVCVSS 3.1CRITICAL 9.8
TI-2024-18054 In JetBrains TeamCity before 2023.11.4 path traversal allowing to perform limited admin actions was possible KEVCVSS 3.1HIGH 7.3
TI-2024-15905 In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible CVSS 3.1CRITICAL 9.8
TI-2024-24589 Insufficiently protected credentials in JetBrains IntelliJ IDEA CVSS 3.1CRITICAL 9.3

See all 787 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences