PT-2026-6787 · Calibre · Calibre

0X5T · Published 2026-02-06 · Updated 2026-04-21 · CVE-2026-25635

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:C/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. The CHM reader contains a path traversal flaw that permits arbitrary file writes in locations where the user possesses write access. On Windows operating systems, this can potentially result in Remote Code Execution by writing a malicious payload to the Startup folder, which is then executed upon the next user login.

Recommendations Update to calibre version 9.2.0.

Exploit

Fix

RCE

Path traversal

Weakness Enumeration

CWE-22

Related Identifiers

CVE-2026-25635

GHSA-32VH-WHVH-9FXR

OPENSUSE-SU-2026:10587-1

Affected Products

Calibre

References · 27

• 🔥 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-32vh-whvh-9fxr · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25635.json · Exploit
• 🔥 https://0x5t.raptx.org/posts/calibre-chm-rce · Exploit
• https://github.com/kovidgoyal/calibre/commit/9739232fcb029ac15dfe52ccd4fdb4a07ebb6ce9 · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2026:10587-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-25635 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-25635 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-25635 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-25635 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-25635 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-25635 · Security Note
• https://osv.dev/vulnerability/CVE-2026-25635 · Vendor Advisory
• https://twitter.com/CVEnew/status/2019876697055854705 · Twitter Post
• https://suse.com/security/cve/CVE-2026-33205 · Note
• https://suse.com/security/cve/CVE-2026-25635 · Note