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Vulnerability record · CVE-2026-53511 · published 7 July 2026

CVE-2026-53511: Code injection 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 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.

8.5 CVSS 4.0 High EPSS 0.20% · top 91.2% CWE-94 · Code injection Deferred
8.5CVSS 4.0 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
18 Aug 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-53511), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.