Vulnerability 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 Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bfe7514d68bc559534
- 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
FAQ
What is CVE-2026-5525?
CVE-2026-5525 is a vulnerability with a CVSS score of 6.0 (MEDIUM). 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 trail...
How severe is CVE-2026-5525?
CVE-2026-5525 has been rated MEDIUM with a CVSS base score of 6.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-5525?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.