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

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Summary

CVECVE-2026-5525
StatePUBLISHED
Assignersecurin
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-10 08:16:26 UTC
Updated2026-04-13 15:02:06 UTC
DescriptionA 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).

Risk And Classification

Primary CVSS: v3.1 6 MEDIUM from 33c584b5-0579-4c06-b2a0-8d8329fcab9c

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

EPSS: 0.000110000 probability, percentile 0.013810000 (date 2026-04-12)

Problem Types: CWE-121 | CWE-121 CWE-121: Stack-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.133c584b5-0579-4c06-b2a0-8d8329fcab9cSecondary6MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
3.1CNACVSS6MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Notepad Project Notepad affected 8.9.3 Not specified
CNA Notepad Project Notepad unaffected 8.9.4 Not specified

References

ReferenceSourceLinkTags
github.com/notepad-plus-plus/notepad-plus-plus/pull/17930 33c584b5-0579-4c06-b2a0-8d8329fcab9c github.com
github.com/notepad-plus-plus/notepad-plus-plus/commit/bfe7514d68bc559534... 33c584b5-0579-4c06-b2a0-8d8329fcab9c github.com
github.com/notepad-plus-plus/notepad-plus-plus/issues/17921 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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