CVE-2026-6539

mediumpriority · track · 0EPSS 0.002 · 9 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.19% (9th) EPSS

CVSS 4.4 · medium

Is it mine?

4 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.

cvss

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

4.6

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1–4.6

v3.14.4mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:Lsecondary · disclosure@vulncheck.comexploitability 1.8 · impact 2.5

v4.04.6mediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:Nsecondary · ENISA EU

v4.04.6mediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · disclosure@vulncheck.com

v4.01lowCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

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

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-134US

affected products (4)

Products and version ranges known to be affected.

Open Source Notepad++ <8.9.4all versionscert_bundDE
Open Source Notepad++< 8.9.4cert_bundDE
Notepad++ Notepad++0 → 8.9.4enisa_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-2026-1282Notepad++: Mehrere Schwachstellen ermöglichen DoS oder die Offenlegung von InformationenDeutsch2026-04-26csaf · cert_bundDE
Ein lokaler Angreifer kann mehrere Schwachstellen in Notepad++ ausnutzen, um einen Denial of Service Angriff durchzuführen, und um Informationen offenzulegen.

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 2026-04-30modified 2026-06-17

references (6)

External citations — patches, advisories, analysis.

scry

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