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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Fri, 01 May 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Notepad-plus-plus
Notepad-plus-plus notepad\+\+
CPEs cpe:2.3:a:notepad-plus-plus:notepad\+\+:8.9.3:*:*:*:*:*:*:*
Vendors & Products Notepad-plus-plus
Notepad-plus-plus notepad\+\+

Fri, 01 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 30 Apr 2026 22:45:00 +0000

Type Values Removed Values Added
First Time appeared Notepad++
Notepad++ notepad++
Vendors & Products Notepad++
Notepad++ notepad++

Thu, 30 Apr 2026 20:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Notepad++ 8.9.3 Format String Injection via nativeLang.xml
Weaknesses CWE-134
References
Metrics cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L'}

cvssV4_0

{'score': 4.6, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-01T14:21:46.872Z

Reserved: 2026-04-17T17:20:47.595Z

Link: CVE-2026-6539

cve-icon Vulnrichment

Updated: 2026-05-01T14:21:41.026Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-30T21:16:33.820

Modified: 2026-05-01T19:30:02.887

Link: CVE-2026-6539

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-02T00:30:16Z

Weaknesses