CVE-2026-85279
Notepad++: Stack Buffer Overflow in Plugin Lexer Loading via Unchecked GetLexerCount() Return Value
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in PluginsManager::loadPluginFromPath in PowerEditor/src/MISC/PluginsManager/PluginsManager.cpp because the plugin-supplied GetLexerCount() result controls a loop that writes to containers[30] without enforcing NB_MAX_EXTERNAL_LANG. A malicious or compromised plugin that reports more than 30 lexers can write beyond the stack array and corrupt control data, which can permit arbitrary code execution in the Notepad++ process context. This issue is fixed in version 8.9.8.
| CWE | CWE-121 |
| Vendor | notepad-plus-plus |
| Product | notepad-plus-plus |
| Published | Sep 22, 2026 |
| Last Updated | Sep 22, 2026 |
Stay Ahead of the Next One
Get instant alerts for notepad-plus-plus notepad-plus-plus
Be the first to know when new high vulnerabilities affecting notepad-plus-plus notepad-plus-plus are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
notepad-plus-plus / notepad-plus-plus
< 8.9.8
References
github.com: https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-h2wq-6x75-h8q2 github.com: https://github.com/notepad-plus-plus/notepad-plus-plus/commit/70b88f95311d88523cde6be1b1ec938aa48c24bc github.com: https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f1e1c71b090d69ca0f0175ab73895da41db67a16 github.com: https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8 notepad-plus-plus.org: https://notepad-plus-plus.org/news/v898-released