Code Injection in Calibre - CVE-2026-53511
Published: June 29, 2026
Vulnerability identifier: #VU135816
CSH Severity: High
CVSS v4.0: 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/E:U/U:Amber
CVE-ID: CVE-2026-53511
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Calibre
Affected software:
Calibre
Calibre
Detailed vulnerability description
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.
How to mitigate CVE-2026-53511
Install updates from vendor's website.