CVE-2026-53511

unknowncovered by 1 sourcefirst seen 2026-07-07

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.

⚡ Watch CVE-2026-53511

Get an email if CVE-2026-53511 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Exploitation outlook

Low exploitation risk0.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Advisory coverage (1)

unknownCVE-2026-53511: calibre is an e-book manager. Prior to 9.10.0, a malicious EPUB, OPF, or PDF file can execute …nvd · 2026-07-07

External references

NVD record for CVE-2026-53511

CVE.org record

Embed the live status

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2026-53511 status](https://www.csirts.com/badge/CVE-2026-53511)](https://www.csirts.com/cve/CVE-2026-53511)