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