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    CVE-2026-30853

    calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0.

    Published:Mar 13, 2026
    Last Modified:Mar 23, 2026
    EPS:Mar 13, 2026
    EPSS Score:0.00013
    CVSS Score:5

    Affected Products

    Vendor
    Calibre-ebook
    Product
    Calibre
    Vendor
    Kovidgoyal
    Product
    Calibre

    Exploits

    https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542x

    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-2026-27824 (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-2026-25636 (CVSS 8.2) — calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversio…
    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