CVE-2026-25636

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.

• CWE-22
• CWE-73
• CWE-94
• CWE-22

• 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

Published

Feb 6, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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