CVE-2026-25635

moderate-risk
Published 2026-02-06

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.

Do I need to act?

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0.08% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.6/10 High
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Calibre-Ebook

References (3)

Patch https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07eb...
Exploit https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr
Exploit https://0x5t.raptx.org/posts/calibre-chm-rce
31
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal