Vulnerability in Calibre-ebook Calibre
CVE-2026-25731
calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows arbitrary code execution when a user converts an ebook using a malicious custom template fil…
EPSS: 0.002 (15.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Calibre-ebook Calibre
- Kovidgoyal Calibre — versions < 9.2.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-25731?
- CVE-2026-25731 is a high-severity vulnerability in Calibre-ebook Calibre, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 7.8/10. Published 2026-02-06.
- How severe is CVE-2026-25731?
- High severity. CVSS v3 base score is 7.8 out of 10.