High severity · published Feb 6, 2026
CVE-2026-25635
calibre has a Path Traversal Leading to Arbitrary File Write and Potential Code Execution
8.6
CVSS
0.5%
EPSS
No
On KEV
Description
calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a path traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows (haven't tested on other OS's), this can lead to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. This vulnerability is fixed in 9.2.0.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CA
calibre · kovidgoyal
< 9.2.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25635
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25635
Patch
https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9
Exploit
https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr
Exploit
https://0x5t.raptx.org/posts/calibre-chm-rce
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