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CVE-2026-26064

calibre: Path Traversal Vulnerability Enables Arbitrary File Write and Remote Code Execution

Published: Feb 20, 2026Updated: Feb 20, 2026 Sources: CVE List NVD BDUCWE-22
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.9%
Top 45.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows, this leads to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. Function extract_pictures only checks startswith('Pictures'), and does not sanitize '..' sequences. calibre's own ZipFile.extractall() in utils/zipfile.py does sanitize '..' via _get_targetpath(), but extract_pictures() bypasses this by using manual zf.read() + open(). This issue has been fixed in version 9.3.0.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-22

Affected Products

calibrekovidgoyal
On-prem
Consumer Software / productivity
calibrecalibre-ebook
On-prem
Consumer Software / productivity
CalibreСообщество свободного программного обеспечения
On-prem
Operating Systems / linux-distro
kovidgoyalindividual-devConsumer Softwareaka calibre, kitty
calibre-ebookoss-projectConsumer Softwareaka calibre
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/kovidgoyal/calibre/security/advisories/GHSA-72ch-3hqc-pgmp
github.com
https://github.com/kovidgoyal/calibre/commit/e1b5f9b45a5e8fa96c136963ad9a1d35e6adac62
github.com
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-72ch-3hqc-pgmp
github.com

Timeline

Published
Feb 20, 2026
Last Updated
Feb 20, 2026

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