SB2026052685 - Multiple vulnerabilities in Notepad++

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Main Vulnerability Database SB2026052685

SB2026052685 - Multiple vulnerabilities in Notepad++

Published: May 26, 2026 Updated: May 31, 2026

Security Bulletin ID SB2026052685
CSH Severity
High
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 67% Low 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Out-of-bounds read (CVE-ID: CVE-2026-48770)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local process to cause a denial of service.

The vulnerability exists due to out-of-bounds read in the WM_COPYDATA COPYDATA_FULL_CMDLINE handler when processing a malformed WM_COPYDATA message. A local process can send a specially crafted IPC message to cause a denial of service.

User interaction is required to have Notepad++ open in the same interactive Windows session.


2) OS Command Injection (CVE-ID: CVE-2026-48778)

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to command injection in the config.xml commandLineInterpreter handling when opening the containing folder in cmd. A remote attacker can supply a crafted config.xml value to execute arbitrary code.

User interaction is required to trigger the File → Open Containing Folder → cmd action.


3) OS Command Injection (CVE-ID: CVE-2026-48800)

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to command injection in the shortcuts.xml UserCommand handling when processing attacker-controlled command entries and the user clicks the corresponding Run menu item. A remote attacker can place a crafted command in shortcuts.xml to execute arbitrary code.

User interaction is required to click the injected Run menu entry, and the malicious entry may appear as a legitimate-looking menu item.


Remediation

Install update from vendor's website.

References