CVE-2026-5525

highpriority · track · 31EPSS 0.002 · 6 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.17% (6th) EPSS

CVSS 7.8 · high

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6–7.8

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.16mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.16mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:Nsecondaryexploitability 0.8 · impact 5.2

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-121US

affected products (3)

Products and version ranges known to be affected.

Open Source Notepad++ 8.9.3all versionscert_bundDEcpe:/a:notepad_plus_plus:notepad%2B%2B:8.9.3
Notepad++ Project Notepad++≤ 8.9.3enisa_euvdEU
notepad-plus-plus notepad++= 8.9.3nvdUScpe:2.3:a:notepad-plus-plus:notepad\+\+:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1059Notepad++: Schwachstelle ermöglicht Denial of ServiceDeutsch2026-04-12csaf · cert_bundDE
Ein lokaler Angreifer kann eine Schwachstelle in Notepad++ ausnutzen, um einen Denial of Service Angriff durchzuführen und möglicherweise eine Speicherbeschädigung zu erreichen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-04-10modified 2026-10-26

references (9)

External citations — patches, advisories, analysis.

scry

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