CVE-2026-25636

HIGH EPSS 11.1%
Published Feb 6, 20264mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Feb 6, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
11.1% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 3

CWE-22 Path Traversal Resource Mgmt
CWE-73
CWE-94 Improper Control of Generation of Code (Code Injection) Injection

Affected Products 1

VendorProductVersionRange
calibre-ebookcalibre* <9.2.0

References 3

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

Remediation

  • github.com https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726
    Patch