CVE-2026-6539

Medium

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.

SeverityMedium

CVSS4.4

Exploit probability—

ProductNotepad-plus-plus Notepad\+\+

PublishedApr 30, 2026

First seenApr 30, 2026

Weakness typeCWE-134CWE-134

How to fix

Patches

notepad-plus-plus.org/news/v894-released/

Affected products

Product	Affected versions	Fixed in
notepad-plus-plus notepad\+\+	8.9.3	—

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