Stack Buffer Overflow in Notepad++ Affects Code Editor Functionality
CVE-2026-85279

8.6HIGH

Key Information:

Vendor

Notepad-plus-plus

Status
Notepad-plus-plus
Vendor
CVE Published:
22 September 2026

What is CVE-2026-85279?

Notepad++, a widely-used open-source source code editor, was found to have a stack buffer overflow in the PluginsManager component prior to version 8.9.8. This vulnerability arises when a plugin reports more than 30 lexers, causing a loop to write beyond the designated stack array size. Such actions can corrupt control data, potentially allowing an attacker to execute arbitrary code within the Notepad++ process. Users are advised to upgrade to version 8.9.8 or later to mitigate this risk.

Affected Version(s)

notepad-plus-plus < 8.9.8

References

https://github.com/notepad-plus-plus/notepad-plus-plus/se...
x_refsource_CONFIRM
https://github.com/notepad-plus-plus/notepad-plus-plus/co...
x_refsource_MISC
https://github.com/notepad-plus-plus/notepad-plus-plus/co...
x_refsource_MISC

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.