PT-2026-6790 · Calibre · Calibre

Dxleryt · Published 2026-02-06 · Updated 2026-04-21 · CVE-2026-25731

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions calibre versions prior to 9.2.0

Description calibre is an e-book manager. A Server-Side Template Injection (SSTI) vulnerability exists in calibre’s Templite templating engine. This allows for 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. Server-Side Template Injection (SSTI) is a flaw that allows an attacker to inject malicious code into a template engine, potentially leading to unauthorized access or control of the system.

Recommendations Update to calibre version 9.2.0 or later.

Exploit

Fix

Weakness Enumeration

CWE-1336

Related Identifiers

CVE-2026-25731

GHSA-XRH9-W7QX-3GCC

OPENSUSE-SU-2026:10587-1

Affected Products

Calibre

References · 26

• 🔥 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-xrh9-w7qx-3gcc · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25731.json · Exploit
• https://github.com/kovidgoyal/calibre/commit/f0649b27512e987b95fcab2e1e0a3bcdafc23379 · Patch
• https://ubuntu.com/security/CVE-2026-25731 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-25731 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10587-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-25731 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-25731 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-25731 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-25731 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-25731 · Vendor Advisory
• https://suse.com/security/cve/CVE-2026-33205 · Note
• https://suse.com/security/cve/CVE-2026-25635 · Note
• https://twitter.com/CVEnew/status/2019876696086966747 · Twitter Post
• https://suse.com/security/cve/CVE-2026-26064 · Note