Path Traversal in Calibre-Ebook Calibre
CVE-2026-25635
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (26.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.001
Affected products
- Calibre-Ebook Calibre
- Kovidgoyal Calibre — versions < 9.2.0
Weakness classification (CWE)
References
- github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr (Exploit, Third Party Advisory)
- github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9 (Patch)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-25635?
- CVE-2026-25635 is a high-severity vulnerability in Calibre-Ebook Calibre, classified under Path Traversal. CVSS score: 8.6/10. Published 2026-02-06.
- How severe is CVE-2026-25635?
- High severity. CVSS v3 base score is 8.6 out of 10.