CVE-2026-86056mediumCWE-476

CVE-2026-86056: medium-severity vulnerability in notepad-plus-plus

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

Published

Follow this CVE+ Monitor notepad-plus-plus

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.5epss 0.2%
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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
notepad-plus-plus · notepad-plus-plus
Related CVEs — notepad-plus-plus

In the same product, most dangerous first.

CVE-2025-15556HIGHNotepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity VerificationEPSS 1.7%KEVCVE-2022-32168HIGHnotepad-plus-plus - DLL HijackingEPSS 0.8%CVE-2025-49144HIGHNotepad++ Privilege Escalation in Installer via Uncontrolled Executable Search PathEPSS 0.7%CVE-2026-48778HIGHNotepad++: Arbitrary Code Execution via config.xml commandLineInterpreterEPSS 0.6%CVE-2023-40031HIGHNotepad++ vulnerable to heap buffer write overflow in Utf8_16_Read::convertEPSS 0.5%CVE-2026-57233HIGHNotepad++: Path Traversal (Zip Slip) in WinGup Plugin ExtractionEPSS 0.5%