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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4744-1 calibre security update
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 18 Aug 2026 08:30:00 +0000

Type Values Removed Values Added
References

Wed, 08 Jul 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 07 Jul 2026 23:00:00 +0000

Type Values Removed Values Added
First Time appeared Kovidgoyal
Kovidgoyal calibre
Vendors & Products Kovidgoyal
Kovidgoyal calibre

Tue, 07 Jul 2026 21:00:00 +0000

Type Values Removed Values Added
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.
Title calibre: Arbitrary Code Execution in Template Formatter via Book Metadata
Weaknesses CWE-94
References
Metrics cvssV4_0

{'score': 8.5, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-18T07:16:16.171Z

Reserved: 2026-06-09T17:30:33.455Z

Link: CVE-2026-53511

cve-icon Vulnrichment

Updated: 2026-08-18T07:16:16.171Z

cve-icon NVD

Status : Deferred

Published: 2026-07-07T21:17:26.380

Modified: 2026-08-18T08:16:42.613

Link: CVE-2026-53511

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-01T17:15:03Z

Weaknesses