CVE-2026-52886

Path Traversal: startswith Prefix Check Bypass Notepad++ — Arbitrary File Read viasession.xml backupFilePath Traversal Advisory GHSA: GHSA-rqfm-pw34-r7j6 CVE: CVE-2026-52886 Severity: Moderate Affected: v8.9.6.4 Patched: v8.9.7 Patch Commit: 7e66f36 Affected File: PowerEditor/src/Notepadplus.cpp...

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-2026-85279

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-2026-85288

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ incompletely enforces shortcuts.xml HMAC validation because WMMACRODLGRUNMACRO, the Run a Macro Multiple Times entry point, calls macroPlayback without the validation used by command. A tampered shortcuts.xml macro...

CVE-2026-85995

Notepad++ is a free and open-source source code editor. From 8.9.7 until 8.9.8, the Notepad++ updater and signature verification path can accept a modified GUP.exe file whose embedded certificate metadata remains present even though its Authenticode digest is invalid. An attacker who can replace ...

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-2026-77605

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the Folder as Workspace Run by system action in Notepad++ can resolve a different sibling file than the file selected by the user. When an attacker places a command script whose name is the selected text-file path with .cmd...

CVE-2026-85995 Notepad++: Authenticode verification bypass allows modified updater execution

Notepad++ is a free and open-source source code editor. From 8.9.7 until 8.9.8, the Notepad++ updater and signature verification path can accept a modified GUP.exe file whose embedded certificate metadata remains present even though its Authenticode digest is invalid. An attacker who can replace ...

CVE-2026-85995

The source code editor Notepad++ is vulnerable in versions 8.9.7 through 8.9.8 due to an improper verification of cryptographic signatures . The updater and signature verification path can accept a modified GUP.exe file where the Authenticode digest is invalid, yet the embedded certificate metada...

CVE-2026-85995 Notepad++: Authenticode verification bypass allows modified updater execution

Notepad++ is a free and open-source source code editor. From 8.9.7 until 8.9.8, the Notepad++ updater and signature verification path can accept a modified GUP.exe file whose embedded certificate metadata remains present even though its Authenticode digest is invalid. An attacker who can replace ...

EUVD-2026-84575

Notepad++ is a free and open-source source code editor. From 8.9.7 until 8.9.8, the Notepad++ updater and signature verification path can accept a modified GUP.exe file whose embedded certificate metadata remains present even though its Authenticode digest is invalid. An attacker who can replace ...

CVE-2026-85995 Notepad++: Authenticode verification bypass allows modified updater execution

Notepad++ is a free and open-source source code editor. From 8.9.7 until 8.9.8, the Notepad++ updater and signature verification path can accept a modified GUP.exe file whose embedded certificate metadata remains present even though its Authenticode digest is invalid. An attacker who can replace ...

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-2026-84574

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

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 ...

CVE-2026-77605 Notepad++ “Run by system” executes *.txt.cmd when user selected *.txt (target confusion → command execution)

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the Folder as Workspace Run by system action in Notepad++ can resolve a different sibling file than the file selected by the user. When an attacker places a command script whose name is the selected text-file path with .cmd...

CVE-2026-77605 Notepad++ “Run by system” executes *.txt.cmd when user selected *.txt (target confusion → command execution)

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the Folder as Workspace Run by system action in Notepad++ can resolve a different sibling file than the file selected by the user. When an attacker places a command script whose name is the selected text-file path with .cmd...

CVE-2026-77605 Notepad++ “Run by system” executes *.txt.cmd when user selected *.txt (target confusion → command execution)

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the Folder as Workspace Run by system action in Notepad++ can resolve a different sibling file than the file selected by the user. When an attacker places a command script whose name is the selected text-file path with .cmd...