# CVE-2026-6539

> Vulnerability · severity: **MEDIUM** (CVSS 4.4).

## 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.

## Key facts

- **CVE ID:** CVE-2026-6539
- **Published:** 2026-04-30
- **CVSS severity:** MEDIUM
- **CVSS base score:** 4.4
- **CWE codes:** CWE-134

## Affected products

- `notepad-plus-plus:notepad\+\+`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6539

## Citation

> AI Analytics. CVE-2026-6539. Retrieved 2026-07-13 from https://api.ai-analytics.org/cve/CVE-2026-6539. Derived from NIST NVD. Licensed CC0.

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