CVE-2026-6539Notepad++ 8.9.3 Format String Injection via nativeLang.xml

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://notepad-plus-plus.org/news/v894-released/ patchRelease Notes
• https://www.vulncheck.com/advisories/notepad-format-string-injection-via-nativelang-xml third-party-advisoryThird Party Advisory