Notepad++: Stack Buffer Overflow in Plugin Lexer Loading via Unchecked GetLexerCount() Return Value

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85279
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-22 18:17:23 UTC
Updated2026-09-23 18:28:25 UTC
DescriptionNotepad++ 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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS: 0.002120000 probability, percentile 0.118380000 (date 2026-09-23)

Problem Types: CWE-121 | CWE-121 CWE-121: Stack-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Notepad-plus-plus Notepad-plus-plus affected < 8.9.8 Not specified

References

ReferenceSourceLinkTags
notepad-plus-plus.org/news/v898-released [email protected] notepad-plus-plus.org
github.com/notepad-plus-plus/notepad-plus-plus/commit/f1e1c71b090d69ca0f... [email protected] github.com
github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8 [email protected] github.com
github.com/notepad-plus-plus/notepad-plus-plus/commit/70b88f95311d88523c... [email protected] github.com
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