Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://github.com/kovidgoyal/calibre/commit/712f4e1ff5c1e798c335bef3bacc4efdee0
- https://github.com/kovidgoyal/calibre/releases/tag/v9.10.0
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-2j4m-2q7x-2c47
- https://lists.debian.org/debian-lts-announce/2026/08/msg00034.html
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-2j4m-2q7x-2c47
FAQ
What is CVE-2026-53511?
CVE-2026-53511 is a documented vulnerability. 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 ...
How severe is CVE-2026-53511?
CVSS scoring is not yet available for CVE-2026-53511. Check NVD for updates.
Is there a patch for CVE-2026-53511?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.