What is CVE-2026-26064?

CVE-2026-26064 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-2026-26064?

High severity. CVSS v3 base score is 8.8 out of 10.

Path Traversal in Calibre-ebook Calibre

CVE-2026-26064

calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.009 (55.4th percentile) — read the EPSS interpretation.

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.

Affected products

Calibre-ebook Calibre
Kovidgoyal Calibre — versions < 9.3.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-26064?: CVE-2026-26064 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-2026-26064?: High severity. CVSS v3 base score is 8.8 out of 10.