CVE-2026-25636

moderate-risk
Published 2026-02-06

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.

Do I need to act?

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0.02% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.2/10 High
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Calibre-Ebook

References (3)

Patch https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de5...
Exploit https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29
Exploit https://0x5t.raptx.org/posts/calibre-epub-rce
30
/ 100
moderate-risk
Severity 25/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal