PT-2026-31894 · Notepad++ · Notepad++

Published 2026-04-10 · Updated 2026-04-10 · CVE-2026-5525

Mitre

CVSS v3.1

6.0

Medium

AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

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).

Exploit

Fix

DoS

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-5525

Affected Products

Notepad++

References · 6

• 🔥 https://github.com/notepad-plus-plus/notepad-plus-plus/issues/17921 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-5525 · Security Note
• https://twitter.com/CVEnew/status/2042561725124481068 · Twitter Post
• https://twitter.com/cyberbivash/status/2042529165023261132 · Twitter Post
• https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bfe7514d68bc559534c046c4ef2d1865267aa2b0 · Note
• https://github.com/notepad-plus-plus/notepad-plus-plus/pull/17930 · Note