# CVE-2026-6539: Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows…

Source: https://junglewise.ai/threats/cve-2026-6539-notepad-8-9-3-contains-a-format-string-injection-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-30  
License: CC BY 4.0 with a link back

CVE-2026-6539 · Severity: medium · CVSS 4.4 · Published 2026-04-30

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.

Technologies: [Notepad++ Notepad\+\+](https://junglewise.ai/threats/technologies/notepad). Vendors: [Notepad++](https://junglewise.ai/threats/vendors/notepad-plus-plus).

## Quick answers

**Is CVE-2026-6539 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6539 being exploited in the wild.

**How severe is CVE-2026-6539?** Medium severity, with a CVSS score of 4.4, published 30 April 2026.

**Which products and versions are affected?** Notepad++ Notepad\+\+. The advisory does not name versions.

**Is there a fix for CVE-2026-6539?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-6539?** Check whether you run Notepad++ Notepad\+\+. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Notepad++ Notepad\+\+

## Related threats

- [Notepad++ stack buffer overflow in file drop handler](https://junglewise.ai/threats/cve-2026-5525-notepad-stack-buffer-overflow-in-file-drop-handler)