Notepad++: Stack Buffer Overflow in expandNppEnvironmentStrs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54758
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-17 20:16:44 UTC
Updated2026-08-17 22:17:14 UTC
DescriptionNotepad++ is a free and open-source source code editor. Prior to 8.9.7, the expandNppEnvironmentStrs function in PowerEditor/src/WinControls/StaticDialog/RunDlg/RunDlg.cpp copies a Notepad++ variable name between $( and ) into the fixed-size wchar_t str[MAX_PATH] stack buffer without bounding the m loop index, allowing a name of 260 or more characters to corrupt adjacent stack data, terminate the process through __report_gsfailure, and potentially execute code. This issue is fixed in version 8.9.7.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.001940000 probability, percentile 0.093860000 (date 2026-08-18)

Problem Types: CWE-121 | CWE-787 | CWE-121 CWE-121: Stack-based Buffer Overflow | CWE-787 CWE-787: Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Notepad-plus-plus Notepad-plus-plus affected < 8.9.7 Not specified

References

ReferenceSourceLinkTags
github.com/notepad-plus-plus/notepad-plus-plus/commit/0a9527e9f7140a2323... [email protected] github.com
github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7 [email protected] github.com
github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-... [email protected] github.com
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