CVE-2026-53511
calibre: Arbitrary Code Execution in Template Formatter via Book Metadata
CVSS Score
0.0
EPSS Score
0.2%
EPSS Percentile
10th
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.
| CWE | CWE-94 |
| Vendor | kovidgoyal |
| Product | calibre |
| Published | Jul 7, 2026 |
| Last Updated | Jul 9, 2026 |
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Affected Versions
kovidgoyal / calibre
< 9.10.0