CVE-2026-53511: high-severity vulnerability in kovidgoyal calibre
calibre: Arbitrary Code Execution in Template Formatter via Book Metadata
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.5epss 0.2%
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
Affected products
kovidgoyal · calibreRelated CVEs — kovidgoyal calibre
In the same product, most dangerous first.
CVE-2026-26064CRITICALcalibre: Path Traversal Vulnerability Enables Arbitrary File Write and Remote Code ExecutionEPSS 1.0%CVE-2026-26065CRITICALcalibre: Path Traversal can Lead to Arbitrary File Write and Potential Code ExecutionEPSS 0.6%CVE-2026-25635HIGHcalibre has a Path Traversal Leading to Arbitrary File Write and Potential Code ExecutionEPSS 0.5%CVE-2026-73249HIGHcalibre Content Server `/book-update-annotations` Missing Write Authorization Check Allows Unauthorized Annotation ModificationEPSS 0.4%CVE-2026-25731HIGHCalibre Affected by Arbitrary Code Execution via Server-Side Template Injection in Calibre HTML ExportEPSS 0.3%CVE-2026-27810MEDIUMcalibre Vulnerable to HTTP Response Header InjectionEPSS 0.2%