Notepad2 CVE-2026-4545

No official vendor patch has been released, as Flos Freeware did not respond to vulnerability disclosure (per VulDB submission 774752). Users of Notepad2 4.2.25 should consider these compensating controls: First, upgrade to a maintained alternative text editor such as Notepad++ or the original Notepad2-mod fork, which has active maintenance. Second, if continued use is required, restrict application deployment to non-privileged user contexts and implement application whitelisting to prevent unauthorized DLL loading from user-writable directories (e.g., using Windows Defender Application Control or AppLocker policies blocking DLL loads outside System32/SysWOW64). Third, apply principle of least privilege by ensuring users running Notepad2 have minimal filesystem write permissions, particularly to the application directory and current working directory. Note that DLL hijacking mitigations may cause application instability if the application legitimately loads plugins or extensions from user directories. Monitor vendor channels (if they resume communication) for future security updates, though the lack of response suggests this may be an abandoned project. For detailed technical analysis, refer to VulDB entry 352372 at https://vuldb.com/?id.352372.