Vulnerability details

CVE-2026-25636

kovidgoyal calibre

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

CVSS 3.1

8.2High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.2High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
kovidgoyal	calibre	< 9.2.0	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-02-06
Last updated: 2026-02-11
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.23%

Probability of exploitation in 30 days

13.9%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-73
External Control of File Name or Path
CWE-94
Improper Control of Generation of Code ('Code Injection')