Description
A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).
Published: 2026-04-10
Score: 6 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 10 Apr 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Notepad++
Notepad++ notepad++
Notepad-plus-plus
Notepad-plus-plus notepad++
Vendors & Products Notepad++
Notepad++ notepad++
Notepad-plus-plus
Notepad-plus-plus notepad++

Fri, 10 Apr 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 10 Apr 2026 08:15:00 +0000

Type Values Removed Values Added
Description A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).
Title Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 6, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N'}


Subscriptions

Notepad++ Notepad++
Notepad-plus-plus Notepad++
cve-icon MITRE

Status: PUBLISHED

Assigner: securin

Published:

Updated: 2026-04-10T12:49:59.124Z

Reserved: 2026-04-04T05:59:46.561Z

Link: CVE-2026-5525

cve-icon Vulnrichment

Updated: 2026-04-10T12:49:44.644Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-10T08:16:26.067

Modified: 2026-04-13T15:02:06.187

Link: CVE-2026-5525

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-10T14:40:55Z

Weaknesses