Public mode

No access to your tenant or devices. Every item links to its source. What this means

CVE-2026-86056

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

CVSS 3.1 5.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-86056

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86056

Published

notepad-plus-plus

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "notepad-plus-plus",
                    "product": "notepad-plus-plus",
                    "versions": [
                        {
                            "version": "< 8.9.8",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON