CVE-2026-48770

Published Jun 26, 2026

Last updated 14 days ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-48770 is a vulnerability identified in Notepad++ that was addressed in version 8.9.6.1, released on May 26, 2026. This flaw is described as a crash vulnerability that can be triggered by malformed structures. Exploitation of CVE-2026-48770 could potentially lead to denial-of-service conditions within the application. This vulnerability was patched alongside other issues, including CVE-2026-48778 and CVE-2026-48800, which involved arbitrary code execution and improper handling of configuration files.

Description: Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDATA_FULL_CMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded NUL-terminated wchar_t* instead of enforcing COPYDATASTRUCT.cbData. This vulnerability is fixed in 8.9.6.1.
Source: security-advisories@github.com
NVD status: Analyzed
Products: notepad\+\+

Risk scores

CVSS 3.1

Type: Secondary
Base score: 5
Impact score: 3.6
Exploitability score: 1.3
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Severity: MEDIUM

Weaknesses

security-advisories@github.com: CWE-125

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:notepad-plus-plus:notepad\\+\\+:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "E0D0325F-713A-4523-8DE8-51517017DC16",
            "versionEndExcluding": "8.9.6.1",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.