CVE-2026-5525

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).

CVSS Vector

References

• https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bfe7514d68bc559534c046c4ef2d1865267aa2b0
• https://github.com/notepad-plus-plus/notepad-plus-plus/issues/17921
• https://github.com/notepad-plus-plus/notepad-plus-plus/pull/17930
• https://github.com/notepad-plus-plus/notepad-plus-plus/issues/17921