Vulnerability Note VU#779243
EpubCheck 4.0.1 contains a XML external entity processing vulnerability
Original Release date: 13 Dec 2016 | Last revised: 14 Dec 2016
EpubCheck 4.0.1 is vulnerable to external XML entity processing attacks.
EpubCheck is a tool to validate that EPUB files follow the proper format.
It can be used as a stand alone command line utility, or included in a project (most commonly being epub readers) as a library.
CWE-611: Improper Restriction of XML External Entity Reference (‘XXE’) – CVE-2016-9487
EpubCheck 4.0.1 does not properly restrict resolving external entities when parsing XML in EPUB files during validation.
An attacker who supplies a specially crafted EPUB file may be able to exploit this behavior to read arbitrary files, or have the victim execute arbitrary requests on his behalf, abusing the victim’s trust relationship with other entities.
A remote attacker may be able to access arbitrary files on a system, or cause the system execute arbitrary requests.
Apply an update
EpubCheck has released version 4.0.2 to address the vulnerability.
Vendor Information (Learn More)
VendorStatusDate NotifiedDate UpdatedAdobeAffected-13 Dec 2016
AppleAffected-14 Dec 2016
International Digital Publishing ForumAffected13 Oct 201609 Dec 2016If you are a vendor and your product is affected, let
CVSS Metrics (Learn More)
Thanks to Craig Arendt for reporting this vulnerability.
This document was written by Trent Novelly.
13 Dec 2016
Date First Published:
13 Dec 2016
Date Last Updated:
14 Dec 2016
FeedbackIf you have feedback, comments, or additional information about this vulnerability, please send us email.