The popular open-source e-book management tool Calibre has just released version 9.0, the second maintenance update in the 9.x series.
The software replaces its HTML templating engine with Mustache, improving both safety and performance. Keep in mind that this is also a breaking change for users relying on custom ZIP output templates, which may require adjustments to remain compatible.
Library management received a new option allowing users to rebuild the annotations search index when checking a library.
On the security fixes side, the CHM input handler now ignores internal files whose paths resolve outside the container, preventing path traversal attacks via malicious CHM files. Similarly, EPUB input handling has been hardened to ensure font obfuscation processing applies only to files contained within the EPUB itself.
The release also resolves a range of regressions and platform-specific bugs introduced in earlier versions. On Windows, Calibre 9.2 includes a workaround for a Qt 6.10 issue that caused the Read Aloud feature in the E-book Viewer to crash when stopped and restarted.
Several bookshelf issues have been fixed, too, including drag-and-drop failures, blank views on some macOS systems, and unnecessary rendering during initial resizing.
Improvements to the E-book Viewer include fixes for broken “Go to page” navigation introduced in Calibre 9.0, illegible Google dictionary lookup results, and PageUp/PageDown behavior requiring repeated key presses at internal HTML boundaries in flow mode. Scrolling behavior in the cover grid has also been corrected after a regression caused the mouse wheel to scroll entire rows at once.
Additional fixes include restoring automatic cleanup of downloaded HTML in the news download feature, which had been broken since version 8.11.
Check out the changelog for more details and the complete list of novelties in the Calibre 9.2 open-source e-book management tool. The update is already live for Windows, macOS, and Linux.
