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CVE-2026-86056

Notepad++: Null pointer dereference in NPPM_SAVESESSION message handler causes crash (DoS) PUBLISHED

Description (CNA)

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPM_SAVESESSION handler in PowerEditor/src/NppBigSwitch.cpp converts lParam to a sessionInfo pointer and dereferences its nbFile, files, and sessionFilePathName members without checking for null. A process running at the same or a higher Windows integrity level on the same desktop can send NPPM_SAVESESSION with a null lParam, immediately terminating Notepad++ and causing denial of service and loss of unsaved documents. This issue is fixed in version 8.9.8.

Affected (CNA)

Vendor / productVersions
notepad-plus-plus / notepad-plus-plusaffected < 8.9.8

CWE

CWE-476

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.