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Vulnerability record · CVE-2026-5525 · published 10 April 2026

CVE-2026-5525: Notepad-plus-plus notepad\+\+ stack-based buffer overflow vulnerability

Notepad Plus Plus · Notepad\+\+

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).

7.8 CVSS 3.1 High EPSS 0.18% · top 92.9% CWE-121 · Stack-based buffer overflow
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bfe7514d68bc559534c046c4ef2d1865267aa2b0 Patch
https://github.com/notepad-plus-plus/notepad-plus-plus/issues/17921 ExploitIssue TrackingMitigationVendor Advisory
https://github.com/notepad-plus-plus/notepad-plus-plus/pull/17930 Issue TrackingPatch
https://github.com/notepad-plus-plus/notepad-plus-plus/issues/17921 ExploitIssue TrackingMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-5525), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.