CVE-2026-5525
Medium
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).
SeverityMedium
CVSS6.0
Exploit probability—
ProductNotepad-plus-plus Notepad\+\+
PublishedApr 10, 2026
First seenApr 10, 2026
Weakness typeCWE-121CWE-121
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| notepad-plus-plus notepad\+\+ | 8.9.3 | — |
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