CVE-2026-25635

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

CVSS 8.6 HIGHEPSS 0.4%CWE-22

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.6EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

06 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

kovidgoyal · calibre

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References

https://0x5t.raptx.org/posts/calibre-chm-rce https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr