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CVE-2026-25636

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

Published: Feb 6, 2026Updated: Feb 17, 2026 Sources: CVE List NVDCWE-22
NVD MITRE
8.2CVSSHIGH
EPSS Score
0.2%
Top 89.0%
CISA KEV
Not in KEV
Exploits
2 Known
Remediation
Patch Available

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 Vector Breakdown

AV:LAC:LPR:NUI:RS:CC:NI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-22CWE-73CWE-94

Affected Products

calibrecalibre-ebook
On-prem
Consumer Software / productivity
calibrekovidgoyal
On-prem
Consumer Software / productivity
calibre-ebookoss-projectConsumer Softwareaka calibre
kovidgoyalindividual-devConsumer Softwareaka calibre, kitty

Attack Graph

Products CVE Techniques Tactics

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Exploitability

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

4 techniques
Collection
Discovery
Execution
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Feb 6, 2026
Last Updated
Feb 17, 2026

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