Code Injection in Calibre - CVE-2026-53511

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Main Vulnerability Database Vulnerabilities #VU135816

Code Injection in Calibre - CVE-2026-53511

Published: June 29, 2026


Vulnerability identifier: #VU135816
CSH Severity: High
CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53511
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation when handling metadata in EPUB, OPF and PDF files. A remote attacker can trick the victim into uploading a specially crafted file and execute arbitrary Python code on the system.


Affected software

Calibre
Fedora
calibre

How to mitigate CVE-2026-53511

Install updates from vendor's website.

Calibre - update to 9.10.0
calibre - addressed in versions 9.11.0-1.fc43, 9.11.0-1.fc44

External References

Related Security Bulletins