CVE-2026-5525 Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS

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...

CVE-2026-5525

CVE-2026-5525 affects Notepad++ up to version 8.9.3. The issue is a stack-based buffer overflow in the file drop handler (WM_DROPFILES) when dropping a directory path of exactly 259 characters without a trailing backslash. The handler appends a backslash and a null terminator without proper bound...

PT-2026-31894

Name of the Vulnerable Software and Affected Versions Notepad++ version 8.9.3 Description A stack-based buffer overflow exists 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 backsla...