CVE-2026-25731 — Improper Neutralization of Special Elements Used in a Template Engine in Calibre

CWE-1336 — Improper Neutralization of Special Elements Used in a Template Engine CWE-917 — Expression Language Injection5 documents5 sources

Severity

7.8HIGHNVD

EPSS

0.0%

top 98.75%

CISA KEV

Not in KEV

Exploit

No known exploits

Affected products

Kovidgoyal Calibre Calibre-ebook Calibre Debian Calibre

Timeline

PublishedFeb 6

Description

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 file via the --template-html or --template-html-index command-line options. This vulnerability is fixed in 9.2.0.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages4 packages

▶NVDcalibre-ebook/calibre< 9.2.0

▶debiandebian/calibre< calibre 9.2.0+ds+~0.10.5-1 (forky)

▶CVEListV5kovidgoyal/calibre< 9.2.0

▶Debiankovidgoyal/calibre< 9.2.0+ds+~0.10.5-1

Patches

Patch: github.com ↗

🔴Vulnerability Details

OSV

CVE-2026-25731: calibre is an e-book manager↗2026-02-06

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📋Vendor Advisories

Red Hat

calibre: Calibre: Arbitrary Code Execution via malicious custom template file during ebook conversion↗2026-02-06

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Debian

CVE-2026-25731: calibre - calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (...↗2026

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🕵️Threat Intelligence

Wiz

CVE-2026-25731 Impact, Exploitability, and Mitigation Steps | Wiz↗

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