CVE-2026-86056

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPMSAVESESSION 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...

CVE-2026-86054

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in NppParameters::writeSession in PowerEditor/src/Parameters.cpp because it copies a session path derived from -settingsDir= into backupPathNameMAXPATH with unbounded wcscpy and...

CVE-2026-86056 Notepad++: Null pointer dereference in NPPM_SAVESESSION message handler causes crash (DoS)

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPMSAVESESSION 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...

CVE-2026-86056

Versions of Notepad++ prior to 8.9.8 are vulnerable to a null pointer dereference in the NPPM_SAVESESSION handler located in PowerEditor/src/NppBigSwitch.cpp . The application fails to verify if lParam is null before dereferencing its nbFile , files , and sessionFilePathName members. An attacker ...

EUVD-2026-84574

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPMSAVESESSION 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...

CVE-2026-86056 Notepad++: Null pointer dereference in NPPM_SAVESESSION message handler causes crash (DoS)

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPMSAVESESSION 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...

CVE-2026-86056 Notepad++: Null pointer dereference in NPPM_SAVESESSION message handler causes crash (DoS)

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPMSAVESESSION 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...

EUVD-2026-84572

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in NppParameters::writeSession in PowerEditor/src/Parameters.cpp because it copies a session path derived from -settingsDir= into backupPathNameMAXPATH with unbounded wcscpy and...

CVE-2026-86054 Notepad++: Stack Buffer Overflow in `NppParameters::writeSession` via overlong session path

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in NppParameters::writeSession in PowerEditor/src/Parameters.cpp because it copies a session path derived from -settingsDir= into backupPathNameMAXPATH with unbounded wcscpy and...

CVE-2026-85279 Notepad++: Stack Buffer Overflow in Plugin Lexer Loading via Unchecked GetLexerCount() Return Value

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in PluginsManager::loadPluginFromPath in PowerEditor/src/MISC/PluginsManager/PluginsManager.cpp because the plugin-supplied GetLexerCount result controls a loop that writes to...

CVE-2026-85279

The source code editor Notepad++ contains a stack buffer overflow in the PluginsManager::loadPluginFromPath function within PowerEditor/src/MISC/PluginsManager/PluginsManager.cpp. This vulnerability exists because the application fails to enforce NB_MAX_EXTERNAL_LANG when processing the plugin-su...

PT-2026-96852

Name of the Vulnerable Software and Affected Versions Notepad++ versions prior to 8.9.8 Description A stack buffer overflow exists in the NppParameters::writeSession function within PowerEditor/src/Parameters.cpp. The issue occurs when the software copies a session path derived from the...

CVE-2026-86054: Stack-based Buffer Overflow

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in NppParameters::writeSession in PowerEditor/src/Parameters.cpp because it copies a session path derived from -settingsDir= into backupPathNameMAXPATH with unbounded wcscpy and...

CVE-2026-86056: NULL Pointer Dereference

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPMSAVESESSION 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...

NotepadPlusPlus: CVE-2026-86054: Stack-based Buffer Overflow

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in NppParameters::writeSession in PowerEditor/src/Parameters.cpp because it copies a session path derived from -settingsDir= into backupPathNameMAXPATH with unbounded wcscpy and...

NotepadPlusPlus: CVE-2026-85279: Stack-based Buffer Overflow

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in PluginsManager::loadPluginFromPath in PowerEditor/src/MISC/PluginsManager/PluginsManager.cpp because the plugin-supplied GetLexerCount result controls a loop that writes to...