CVE-2026-53511

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.

CVSS 4.0

8.5CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-25)

CWE

CWE-94

Published

2026-07-07

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://github.com/kovidgoyal/calibre/commit/712f4e1ff5c1e798c335bef3bacc4efdee052e9c
• 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

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