Eval Injection in Calibre - CVE-2026-73248
Published: August 3, 2026 / Updated: August 13, 2026
Vulnerability identifier: #VU140778
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73248
CWE-ID: CWE-95
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to improper neutralization of directives in dynamically evaluated code in the template() function and formatter when processing crafted composite_template metadata from an opened document. A remote attacker can trick the victim into opening a crafted EPUB or PDF file to execute arbitrary code.
User interaction is required to open a crafted file.
Affected software
Calibre
How to mitigate CVE-2026-73248
Install security update from vendor's website.
Calibre - update to 9.12.0