CVE-2026-5525

Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS

Published Apr 10, 2026 CVSS 3.1 · 6 Medium EPSS < 1% KEV · Not listed
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).

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Notepad-plus-plus notepad\+\+
CPEs cpe:2.3:a:notepad-plus-plus:notepad\+\+:8.9.3:*:*:*:*:*:*:*
Vendors & Products Notepad-plus-plus notepad\+\+
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++
Type Values Removed Values Added
Metrics ssvc

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
securin
Published
Updated
Apr 10, 2026, 12:49 PM
Reserved
Apr 4, 2026, 5:59 AM
Status
Analyzed
Published
Apr 10, 2026, 8:16 AM
Modified
Oct 26, 2026, 9:10 PM