Path Traversal in Calibre-Ebook Calibre
CVE-2026-26065
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below are vulnerable to Path Traversal through PDB readers (both 132-byte and 202-byte header variants) that allow arbitrary file writes with arbitrary extension and arbitrary content anywhere the user has write permissions. Files are written in 'wb' mode, silently overwriting existing files. This can lead to potential code execution and Denial of Service through file corruption. This issue has been fixed in version 9.3.0.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000
Affected products
- Calibre-Ebook Calibre
- Kovidgoyal Calibre — versions < 9.3.0
Weakness classification (CWE)
References
- github.com/kovidgoyal/calibre/security/advisories/GHSA-vmfh-7mr7-pp2w (Exploit, Third Party Advisory)
- github.com/kovidgoyal/calibre/commit/b6da1c3878c06eb1356cb0ec1106cb66e0e9bfb8 (Patch)
Frequently asked questions
- What is CVE-2026-26065?
- CVE-2026-26065 is a high-severity vulnerability in Calibre-Ebook Calibre, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-02-20.
- How severe is CVE-2026-26065?
- High severity. CVSS v3 base score is 8.8 out of 10.