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Notepad++ 8.9.6.4
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8.9.6.2β8.9.6.4SecurityBug fix
β¦ Editor's summary
Notepad++ 8.9.6.4 is a maintenance release that fixes a newly discovered security vulnerability in the HMAC implementation and resolves several regressions introduced in previous releases. The update improves installer behavior and Windows Explorer integration while enhancing overall application stability.
β Security impact
- Fixed a TOCTOU (Time-of-check to Time-of-use) vulnerability in the HMAC implementation (CVE-2026-52885).
- Addresses a security issue introduced in previous 8.9.6.x releases.
- Users are recommended to upgrade to the latest version to improve application security.
What's new
- Updated Notepad++ to version 8.9.6.4.
- Fixed a TOCTOU vulnerability in the HMAC implementation (CVE-2026-52885).
- Resolved an MSI installer regression that could leave outdated entries in Programs and Features.
- Fixed an issue where "Open Containing Folder in Explorer" launched multiple Explorer processes.
- Included additional regression fixes and overall stability improvements.
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