PT-2026-6788 · Calibre · Calibre

0X5T + 1 · Published 2026-02-06 · Updated 2026-04-21 · CVE-2026-25636

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

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

Name of the Vulnerable Software and Affected Versions calibre versions 9.1.0 and earlier

Description calibre is an e-book manager. A path traversal flaw exists in the EPUB conversion process. A crafted EPUB file can potentially corrupt existing files that the calibre process has write access to. During conversion, calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even if the path is outside the designated conversion directory. The vulnerability involves resolving a URI to a filesystem path and opening it in read-write mode.

Recommendations Update to version 9.2.0 or later.

Exploit

Fix

Path traversal

Code Injection

Weakness Enumeration

CWE-22

CWE-94

CWE-73

Related Identifiers

CVE-2026-25636

GHSA-8R26-M7J5-HM29

OPENSUSE-SU-2026:10587-1

Affected Products

Calibre

References · 28

• 🔥 https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25636.json · Exploit
• 🔥 https://0x5t.raptx.org/posts/calibre-epub-rce · Exploit
• https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726 · Patch
• https://osv.dev/vulnerability/openSUSE-SU-2026:10587-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-25636 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-25636 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-25636 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-25636 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-25636 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-25636 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-25636 · Security Note
• https://suse.com/security/cve/CVE-2026-33205 · Note
• https://t.me/cveNotify/152245 · Telegram Post
• https://suse.com/security/cve/CVE-2026-25635 · Note