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    CVE-2026-25636

    calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.

    Published:Feb 6, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 6, 2026
    EPSS Score:0.00026
    CVSS Score:8.2

    Affected Products

    Vendor
    Calibre-ebook
    Product
    Calibre
    Vendor
    Kovidgoyal
    Product
    Calibre

    Exploits

    https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29https://0x5t.raptx.org/posts/calibre-epub-rce

    Related CVEs

    CVE-2026-33206 (CVSS 8.2) — calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to …
    CVE-2026-33205 (CVSS 4.8) — calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to …
    CVE-2026-30853 (CVSS 5) — calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to …
    CVE-2026-27824 (CVSS 5.3) — calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to …
    CVE-2026-27810 (CVSS 6.4) — calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to …
    CVE-2026-26065 (CVSS 9.3) — calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions …
    CVE-2026-26064 (CVSS 9.3) — calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions …
    CVE-2026-25731 (CVSS 7.8) — calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre…
    CVE-2026-25635 (CVSS 8.6) — calibre is an e-book manager. Prior to 9.2.0, Calibre's CHM reader contains a path traversal vulnerability tha…
    CVE-2024-7009 (CVSS 4.2) — Unsanitized user-input in Calibre <= 7.15.0 allow users with permissions to perform full-text searches to achi…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High