p PatchFirst

CVE-2026-73248

CVE-2026-73248 · calibre: Bypass of Python template restrictions via nested `template()` leading to RCE

This page contains facts from public vulnerability sources. Check the original advisory before updating.

calibre is an e-book manager. Prior to 9.12.0, calibre processes attacker-controlled composite_template metadata from a malicious EPUB, OPF, PDF, or similar file through program: and a nested template() call whose formatter does not inherit allow_python_templates=False, allowing a nested python: template to reach compile_python_template and execute arbitrary Python code when the file is opened or imported. This issue is fixed in version 9.12.0.

CVSS 8.5 · High · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • calibre

    Versions
    • < 9.12.0: Affected

    No fix published

  • calibre Debian:12

    Versions
    • 6.13.0+repack-2
    • 6.13.0+repack-2+deb12u1
    • 6.13.0+repack-2+deb12u10
    • 6.13.0+repack-2+deb12u2
    • 6.13.0+repack-2+deb12u3
    • 6.13.0+repack-2+deb12u4
    • 6.13.0+repack-2+deb12u5
    • 6.13.0+repack-2+deb12u6
    • 6.13.0+repack-2+deb12u7
    • 6.13.0+repack-2+deb12u8
    • 6.13.0+repack-2+deb12u9
    • 6.14.0-1
    • 6.14.1-1
    • 6.15.0-1
    • 6.15.1-1
    • 6.15.1-2
    • 6.15.1-3
    • 6.15.1-4
    • 6.16.0-1
    • 6.17.0-1
    • 6.18.1-1
    • 6.18.1-2
    • 6.18.1-3
    • 6.19.1-1
    • 6.20.0-1
    • 6.21.0-1
    • 6.21.0-2
    • 6.22.0-1
    • 6.23.0-1
    • 6.23.0-2
    • 6.24.0+ds-1
    • 6.24.0-1
    • 6.24.0-2
    • 6.25.0+ds-1
    • 6.26.0+ds-1
    • 6.27.0+ds-1
    • 6.28.0+ds-1
    • 6.28.1+ds-1
    • 6.29.0+ds-1
    • 7.0.0+ds-1
    • 7.1.0+ds-1
    • 7.1.0+ds-2
    • 7.10.0+ds-1
    • 7.11.0+ds-1
    • 7.12.0+ds-1
    • 7.12.0+ds-2
    • 7.12.0+ds-3
    • 7.13.0+ds-1
    • 7.13.0+ds-2
    • 7.14.0+ds-1
    • 7.15.0+ds-1
    • 7.16.0+ds-1
    • 7.16.0+ds-2
    • 7.16.0+ds-3
    • 7.17.0+ds-1
    • 7.17.0+ds-2
    • 7.17.0+ds-3
    • 7.17.0+ds-4
    • 7.18.0+ds-1
    • 7.19.0+ds-1
    • 7.19.0+ds-2
    • 7.2.0+ds-1
    • 7.20.0+ds-1
    • 7.21.0+ds-1
    • 7.21.0+ds-2
    • 7.22.0+ds-1
    • 7.22.0+ds-2
    • 7.23.0+ds-1
    • 7.23.0+ds-2
    • 7.24.0+ds-1
    • 7.24.0+ds-2
    • 7.25.0+ds-1
    • 7.26.0+ds-1
    • 7.26.0+ds-2
    • 7.26.0+ds-3
    • 7.26.0+ds-4
    • 7.3.0+ds-1
    • 7.4.0+ds-1
    • 7.5.1+ds-1
    • 7.5.1+ds-2
    • 7.5.1+ds-3
    • 7.6.0+ds-1
    • 7.7.0+ds-1
    • 7.7.0+ds-2
    • 7.8.0+ds1-1
    • 7.8.0+ds1-2
    • 7.8.0+ds2-1
    • 7.9.0+ds-1
    • 7.9.0+ds-2
    • 8.0.0+ds-1
    • 8.0.1+ds-1
    • 8.1.0+ds-1
    • 8.1.1+ds-1
    • 8.10.0+ds-1
    • 8.10.0+ds-2
    • 8.10.0+ds-3
    • 8.11.0+ds+~0.10.5-1
    • 8.11.1+ds+~0.10.5-1
    • 8.11.1+ds+~0.10.5-2
    • 8.11.1+ds+~0.10.5-3
    • 8.12.0+ds+~0.10.5-1
    • 8.13.0+ds+~0.10.5-1
    • 8.13.0+ds+~0.10.5-2
    • 8.13.0+ds+~0.10.5-3
    • 8.14.0+ds+~0.10.5-1
    • 8.14.0+ds+~0.10.5-1~bpo13+1
    • 8.15.0+ds+~0.10.5-1
    • 8.15.0+ds+~0.10.5-1~bpo13+1
    • 8.15.0+ds+~0.10.5-2
    • 8.16.0+ds+~0.10.5-1
    • 8.16.0+ds+~0.10.5-2
    • 8.16.1+ds+~0.10.5-1
    • 8.16.2+ds+~0.10.5-1
    • 8.16.2+ds+~0.10.5-2
    • 8.16.2+ds+~0.10.5-3
    • 8.16.2+ds+~0.10.5-3~bpo13+1
    • 8.2.1+ds-1
    • 8.2.100+ds-1
    • 8.3.0+ds-1
    • 8.4.0+ds-1
    • 8.4.0+ds1-1~exp1
    • 8.5.0+ds-1
    • 8.6.0+ds-1
    • 8.7.0+ds-1
    • 8.8.0+ds-1
    • 8.8.0+ds-2
    • 8.8.0+ds-2+gcc15
    • 8.8.0+ds-3
    • 8.9.0+ds-1
    • 8.9.0+ds-2
    • 8.9.0+ds-3
    • 8.9.0+ds-4
    • 9.0.0+ds+~0.10.5-1
    • 9.1.0+ds+~0.10.5-1
    • 9.10.0+ds+~0.10.6-1
    • 9.10.0+ds+~0.10.6-2
    • 9.11.0+ds+~0.10.6-1
    • 9.11.0+ds+~0.10.6-2
    • 9.12.0+ds+~0.10.6-1
    • 9.13.0+ds+~0.10.6-1
    • 9.14.0+ds+~0.10.6-1
    • 9.14.0+ds+~0.10.6-2
    • 9.15.0+ds+~1.1.2-1
    • 9.15.0+ds+~1.1.2-2
    • 9.15.0+ds+~1.1.2-3
    • 9.16.0+ds+~1.1.2-1
    • 9.17.0+ds+~1.1.2-1
    • 9.2.0+ds+~0.10.5-1
    • 9.2.1+ds+~0.10.5-1
    • 9.2.1+ds+~0.10.5-2
    • 9.3.0+ds+~0.10.5-1
    • 9.3.1+ds+~0.10.5-1
    • 9.4.0+ds+~0.10.5-1
    • 9.5.0+ds+~0.10.5-1
    • 9.6.0+ds+~0.10.5-1
    • 9.6.0+ds+~0.10.5-2
    • 9.6.0+ds+~0.10.5-3
    • 9.6.0+ds+~0.10.5-4
    • 9.6.0+ds+~0.10.5-5
    • 9.6.0+ds+~0.10.5-6
    • 9.7.0+ds+~0.10.5-1
    • 9.7.0+ds+~0.10.5-2
    • 9.8.0+ds+~0.10.5-1
    • 9.8.0+ds+~0.10.5-2
    • 9.8.0+ds+~0.10.5-3
    • 9.8.0+ds+~0.10.5-4
    • 9.8.0+ds+~0.10.5-5
    • 9.8.0+ds+~0.10.6-1
    • 9.8.0+ds+~0.10.6-2
    • 9.9.0+ds+~0.10.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • calibre Debian:13

    Versions
    • 8.10.0+ds-1
    • 8.10.0+ds-2
    • 8.10.0+ds-3
    • 8.11.0+ds+~0.10.5-1
    • 8.11.1+ds+~0.10.5-1
    • 8.11.1+ds+~0.10.5-2
    • 8.11.1+ds+~0.10.5-3
    • 8.12.0+ds+~0.10.5-1
    • 8.13.0+ds+~0.10.5-1
    • 8.13.0+ds+~0.10.5-2
    • 8.13.0+ds+~0.10.5-3
    • 8.14.0+ds+~0.10.5-1
    • 8.14.0+ds+~0.10.5-1~bpo13+1
    • 8.15.0+ds+~0.10.5-1
    • 8.15.0+ds+~0.10.5-1~bpo13+1
    • 8.15.0+ds+~0.10.5-2
    • 8.16.0+ds+~0.10.5-1
    • 8.16.0+ds+~0.10.5-2
    • 8.16.1+ds+~0.10.5-1
    • 8.16.2+ds+~0.10.5-1
    • 8.16.2+ds+~0.10.5-2
    • 8.16.2+ds+~0.10.5-3
    • 8.16.2+ds+~0.10.5-3~bpo13+1
    • 8.5.0+ds-1
    • 8.5.0+ds-1+deb13u1
    • 8.5.0+ds-1+deb13u2
    • 8.5.0+ds-1+deb13u3
    • 8.6.0+ds-1
    • 8.7.0+ds-1
    • 8.8.0+ds-1
    • 8.8.0+ds-2
    • 8.8.0+ds-2+gcc15
    • 8.8.0+ds-3
    • 8.9.0+ds-1
    • 8.9.0+ds-2
    • 8.9.0+ds-3
    • 8.9.0+ds-4
    • 9.0.0+ds+~0.10.5-1
    • 9.1.0+ds+~0.10.5-1
    • 9.10.0+ds+~0.10.6-1
    • 9.10.0+ds+~0.10.6-2
    • 9.11.0+ds+~0.10.6-1
    • 9.11.0+ds+~0.10.6-2
    • 9.12.0+ds+~0.10.6-1
    • 9.13.0+ds+~0.10.6-1
    • 9.14.0+ds+~0.10.6-1
    • 9.14.0+ds+~0.10.6-2
    • 9.15.0+ds+~1.1.2-1
    • 9.15.0+ds+~1.1.2-2
    • 9.15.0+ds+~1.1.2-3
    • 9.16.0+ds+~1.1.2-1
    • 9.17.0+ds+~1.1.2-1
    • 9.2.0+ds+~0.10.5-1
    • 9.2.1+ds+~0.10.5-1
    • 9.2.1+ds+~0.10.5-2
    • 9.3.0+ds+~0.10.5-1
    • 9.3.1+ds+~0.10.5-1
    • 9.4.0+ds+~0.10.5-1
    • 9.5.0+ds+~0.10.5-1
    • 9.6.0+ds+~0.10.5-1
    • 9.6.0+ds+~0.10.5-2
    • 9.6.0+ds+~0.10.5-3
    • 9.6.0+ds+~0.10.5-4
    • 9.6.0+ds+~0.10.5-5
    • 9.6.0+ds+~0.10.5-6
    • 9.7.0+ds+~0.10.5-1
    • 9.7.0+ds+~0.10.5-2
    • 9.8.0+ds+~0.10.5-1
    • 9.8.0+ds+~0.10.5-2
    • 9.8.0+ds+~0.10.5-3
    • 9.8.0+ds+~0.10.5-4
    • 9.8.0+ds+~0.10.5-5
    • 9.8.0+ds+~0.10.6-1
    • 9.8.0+ds+~0.10.6-2
    • 9.9.0+ds+~0.10.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • calibre Debian:14

    Versions
    • 8.10.0+ds-1
    • 8.10.0+ds-2
    • 8.10.0+ds-3
    • 8.11.0+ds+~0.10.5-1
    • 8.11.1+ds+~0.10.5-1
    • 8.11.1+ds+~0.10.5-2
    • 8.11.1+ds+~0.10.5-3
    • 8.12.0+ds+~0.10.5-1
    • 8.13.0+ds+~0.10.5-1
    • 8.13.0+ds+~0.10.5-2
    • 8.13.0+ds+~0.10.5-3
    • 8.14.0+ds+~0.10.5-1
    • 8.14.0+ds+~0.10.5-1~bpo13+1
    • 8.15.0+ds+~0.10.5-1
    • 8.15.0+ds+~0.10.5-1~bpo13+1
    • 8.15.0+ds+~0.10.5-2
    • 8.16.0+ds+~0.10.5-1
    • 8.16.0+ds+~0.10.5-2
    • 8.16.1+ds+~0.10.5-1
    • 8.16.2+ds+~0.10.5-1
    • 8.16.2+ds+~0.10.5-2
    • 8.16.2+ds+~0.10.5-3
    • 8.16.2+ds+~0.10.5-3~bpo13+1
    • 8.5.0+ds-1
    • 8.6.0+ds-1
    • 8.7.0+ds-1
    • 8.8.0+ds-1
    • 8.8.0+ds-2
    • 8.8.0+ds-2+gcc15
    • 8.8.0+ds-3
    • 8.9.0+ds-1
    • 8.9.0+ds-2
    • 8.9.0+ds-3
    • 8.9.0+ds-4
    • 9.0.0+ds+~0.10.5-1
    • 9.1.0+ds+~0.10.5-1
    • 9.10.0+ds+~0.10.6-1
    • 9.10.0+ds+~0.10.6-2
    • 9.11.0+ds+~0.10.6-1
    • 9.11.0+ds+~0.10.6-2
    • 9.2.0+ds+~0.10.5-1
    • 9.2.1+ds+~0.10.5-1
    • 9.2.1+ds+~0.10.5-2
    • 9.3.0+ds+~0.10.5-1
    • 9.3.1+ds+~0.10.5-1
    • 9.4.0+ds+~0.10.5-1
    • 9.5.0+ds+~0.10.5-1
    • 9.6.0+ds+~0.10.5-1
    • 9.6.0+ds+~0.10.5-2
    • 9.6.0+ds+~0.10.5-3
    • 9.6.0+ds+~0.10.5-4
    • 9.6.0+ds+~0.10.5-5
    • 9.6.0+ds+~0.10.5-6
    • 9.7.0+ds+~0.10.5-1
    • 9.7.0+ds+~0.10.5-2
    • 9.8.0+ds+~0.10.5-1
    • 9.8.0+ds+~0.10.5-2
    • 9.8.0+ds+~0.10.5-3
    • 9.8.0+ds+~0.10.5-4
    • 9.8.0+ds+~0.10.5-5
    • 9.8.0+ds+~0.10.6-1
    • 9.8.0+ds+~0.10.6-2
    • 9.9.0+ds+~0.10.6-1
    Affected ranges
    • ECOSYSTEM: < 9.12.0+ds+~0.10.6-1

    Update to 9.12.0+ds+~0.10.6-1

  • calibre Ubuntu:16.04:LTS

    Versions
    • 2.33.0+dfsg-1build1
    • 2.38.0+dfsg-1
    • 2.45.0+dfsg-1
    • 2.45.0+dfsg-1build1
    • 2.48.0+dfsg-1
    • 2.48.0+dfsg-1build1
    • 2.54.0+dfsg-1
    • 2.55.0+dfsg-1
    • 2.55.0+dfsg-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • calibre Ubuntu:18.04:LTS

    Versions
    • 3.7.0+dfsg-2
    • 3.7.0+dfsg-2build1
    • 3.12.0+dfsg-1
    • 3.13.0+dfsg-1
    • 3.14.0+dfsg-1
    • 3.15.0.1+dfsg-1
    • 3.16.0+dfsg-1
    • 3.16.0+dfsg-1build1
    • 3.17.0+dfsg-1
    • 3.17.0+dfsg-2
    • 3.18.0+dfsg-1build1
    • 3.19.0+dfsg-1
    • 3.20.0+dfsg-1
    • 3.21.0+dfsg-1
    • 3.21.0+dfsg-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • calibre Ubuntu:20.04:LTS

    Versions
    • 3.46.0+dfsg-1
    • 4.2.0+dfsg-2
    • 4.3.0+dfsg-1
    • 4.3.0+dfsg-2
    • 4.4.0+dfsg-1
    • 4.5.0+dfsg-1
    • 4.5.0+dfsg-2
    • 4.5.0+dfsg-3
    • 4.6.0+dfsg-1
    • 4.7.0+dfsg-1
    • 4.99.3+dfsg-2
    • 4.99.4+dfsg-1
    • 4.99.4+dfsg-1build1
    • 4.99.4+dfsg+really4.10.0+py3-2
    • 4.99.4+dfsg+really4.11.2-1
    • 4.99.4+dfsg+really4.11.2-1build1
    • 4.99.4+dfsg+really4.12.0-1
    • 4.99.4+dfsg+really4.12.0-1build1
    • 4.99.4+dfsg+really4.12.0-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • calibre Ubuntu:22.04:LTS

    Versions
    • 5.25.0+dfsg-2
    • 5.33.2+dfsg-1
    • 5.34.0+dfsg-1
    • 5.35.0+dfsg-1ubuntu2
    • 5.37.0+dfsg-1
    • 5.37.0+dfsg-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • calibre Ubuntu:24.04:LTS

    Versions
    • 6.24.0+ds-1
    • 6.29.0+ds-1
    • 7.0.0+ds-1
    • 7.1.0+ds-1
    • 7.1.0+ds-2
    • 7.2.0+ds-1
    • 7.2.0+ds-1build1
    • 7.3.0+ds-1
    • 7.4.0+ds-1
    • 7.5.1+ds-1
    • 7.5.1+ds-2
    • 7.5.1+ds-3
    • 7.6.0+ds-1
    • 7.6.0+ds-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • calibre Ubuntu:26.10

    Versions
    • 9.2.1+ds+~0.10.5-2build1
    • 9.9.0+ds+~0.10.6-1
    • 9.11.0+ds+~0.10.6-1
    • 9.11.0+ds+~0.10.6-2
    • 9.13.0+ds+~0.10.6-1
    • 9.14.0+ds+~0.10.6-2build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • calibre Ubuntu:26.04:LTS

    Versions
    • 8.8.0+ds-3build1
    • 8.13.0+ds+~0.10.5-3
    • 8.14.0+ds+~0.10.5-1
    • 8.15.0+ds+~0.10.5-1
    • 8.16.0+ds+~0.10.5-2
    • 8.16.2+ds+~0.10.5-1
    • 8.16.2+ds+~0.10.5-2
    • 8.16.2+ds+~0.10.5-3
    • 9.2.1+ds+~0.10.5-2build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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