CVE-2026-25636

calibre has a Path Traversal Leading to Arbitrary File Corruption and Code Execution

CVSS 8.2 HIGHEPSS 0.2%CWE-22 CWE-73 CWE-94

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.2EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

06 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

kovidgoyal · calibre

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References

https://0x5t.raptx.org/posts/calibre-epub-rce https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29