CVE-2026-25636

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-22 CWE-73 CWE-94

Affected software

Vendor	Product	Versions
kovidgoyal	calibre	< 9.2.0

References

https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726Patch
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29Exploit, Third Party Advisory
https://0x5t.raptx.org/posts/calibre-epub-rceExploit, Third Party Advisory

Timeline

Published: Feb 6, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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