CVE-2026-53511
calibre: Arbitrary Code Execution in Template Formatter via Book Metadata
CVSS Score
0.0
EPSS Score
0.1%
EPSS Percentile
5th
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 | Aug 18, 2026 |
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Affected Versions
kovidgoyal / calibre
< 9.10.0
References
github.com: https://github.com/kovidgoyal/calibre/security/advisories/GHSA-2j4m-2q7x-2c47 github.com: https://github.com/kovidgoyal/calibre/commit/712f4e1ff5c1e798c335bef3bacc4efdee052e9c github.com: https://github.com/kovidgoyal/calibre/releases/tag/v9.10.0 lists.debian.org: https://lists.debian.org/debian-lts-announce/2026/08/msg00034.html