CVE-2026-85279 Notepad++ - Buffer Overflow

Notepad++ < 8.9.8 contains a stack buffer overflow caused by unchecked plugin-supplied GetLexerCount() results in PluginsManager::loadPluginFromPath, letting malicious plugins execute arbitrary code, exploit requires malicious or compromised plugin.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.22% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-121

Vendor fix

Update to version 8.9.8 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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