Vulnerability · Published Apr 10, 2026 · Assigned by securin
CVE-2026-5525Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS
Medium 6.0
In plain English
A medium-severity stack buffer overflow in Notepad++ from Notepad++ Project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).
Official 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).
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Notepad++ Project | Notepad++ | 8.9.3 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N