CVE-2026-53511 — calibre: Arbitrary Code Execution in Template Formatter via Book Metadata
calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add b…
Published: 2026-07-07 · CVSS: 8.5 · CVSS 4.0
calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute arbitrary Python code when its metadata is read by calibre, including through Add books or Edit books, by embedding a custom column definition with a python: template in calibre:user_metadata that is passed unsanitized to exec() in the template formatter. This issue is fixed in version 9.10.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7