CVE-2026-30853

calibre has a Path Traversal Leading to Arbitrary File Write

5.0 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: Low

Exploit likelihood

0.19%Up 0.2 points since Mar 14, 2026

What each source reports

CVE List Score used 5.0

calibre has a Path Traversal Leading to Arbitrary File Write

Record: CVE-2026-30853
CVSS 3.1: 5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
Weakness: CWE-22
Updated: 2026-11-02

EUVDEUVD-2026-12069 5.0

Record: EUVD-2026-12069
CVSS 3.1: 5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
Updated: 2026-11-02

NVD 5.0

Record: CVE-2026-30853
CVSS 3.1: 5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H
Weakness: CWE-22
Updated: 2026-11-02

OSV 5.0

calibre has a Path Traversal Leading to Arbitrary File Write

Record: CVE-2026-30853
CVSS 3.1: 5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
Weakness: CWE-22
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-30853 8.2

Record: DEBIAN-CVE-2026-30853
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-30853 5.0

Record: UBUNTU-CVE-2026-30853
CVSS 3.1: 5.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H
Updated: 2026-11-02

OSVopenSUSE-SU-2026:10587-1 No score

calibre-9.7.0-1.1 on GA media

These are all security issues fixed in the calibre-9.7.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:10587-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`calibre` Debian:12	before 6.13.0+repack-2+deb12u8, plus listed versions 6.13.0+repack-26.13.0+repack-2+deb12u16.13.0+repack-2+deb12u26.13.0+repack-2+deb12u36.13.0+repack-2+deb12u46.13.0+repack-2+deb12u56.13.0+repack-2+deb12u66.13.0+repack-2+deb12u7	6.13.0+repack-2+deb12u8
`calibre` Debian:13	before 8.5.0+ds-1+deb13u3, plus listed versions 8.5.0+ds-18.5.0+ds-1+deb13u18.5.0+ds-1+deb13u2	8.5.0+ds-1+deb13u3
`calibre` Debian:14	before 9.5.0+ds+~0.10.5-1, plus listed versions 8.10.0+ds-18.10.0+ds-28.10.0+ds-38.11.0+ds+~0.10.5-18.11.1+ds+~0.10.5-1 Show 37 moreShow less 8.11.1+ds+~0.10.5-28.11.1+ds+~0.10.5-38.12.0+ds+~0.10.5-18.13.0+ds+~0.10.5-18.13.0+ds+~0.10.5-28.13.0+ds+~0.10.5-38.14.0+ds+~0.10.5-18.14.0+ds+~0.10.5-1~bpo13+18.15.0+ds+~0.10.5-18.15.0+ds+~0.10.5-1~bpo13+18.15.0+ds+~0.10.5-28.16.0+ds+~0.10.5-18.16.0+ds+~0.10.5-28.16.1+ds+~0.10.5-18.16.2+ds+~0.10.5-18.16.2+ds+~0.10.5-28.16.2+ds+~0.10.5-38.16.2+ds+~0.10.5-3~bpo13+18.5.0+ds-18.6.0+ds-18.7.0+ds-18.8.0+ds-18.8.0+ds-28.8.0+ds-2+gcc158.8.0+ds-38.9.0+ds-18.9.0+ds-28.9.0+ds-38.9.0+ds-49.0.0+ds+~0.10.5-19.1.0+ds+~0.10.5-19.2.0+ds+~0.10.5-19.2.1+ds+~0.10.5-19.2.1+ds+~0.10.5-29.3.0+ds+~0.10.5-19.3.1+ds+~0.10.5-19.4.0+ds+~0.10.5-1	9.5.0+ds+~0.10.5-1
`calibre` Ubuntu:16.04:LTS	All versions, plus listed versions 2.33.0+dfsg-1build12.38.0+dfsg-12.45.0+dfsg-12.45.0+dfsg-1build12.48.0+dfsg-1 Show 4 moreShow less 2.48.0+dfsg-1build12.54.0+dfsg-12.55.0+dfsg-12.55.0+dfsg-1ubuntu0.2	None known
`calibre` Ubuntu:18.04:LTS	All versions, plus listed versions 3.7.0+dfsg-23.7.0+dfsg-2build13.12.0+dfsg-13.13.0+dfsg-13.14.0+dfsg-1 Show 10 moreShow less 3.15.0.1+dfsg-13.16.0+dfsg-13.16.0+dfsg-1build13.17.0+dfsg-13.17.0+dfsg-23.18.0+dfsg-1build13.19.0+dfsg-13.20.0+dfsg-13.21.0+dfsg-13.21.0+dfsg-1build1	None known
`calibre` Ubuntu:20.04:LTS	All versions, plus listed versions 3.46.0+dfsg-14.2.0+dfsg-24.3.0+dfsg-14.3.0+dfsg-24.4.0+dfsg-1 Show 14 moreShow less 4.5.0+dfsg-14.5.0+dfsg-24.5.0+dfsg-34.6.0+dfsg-14.7.0+dfsg-14.99.3+dfsg-24.99.4+dfsg-14.99.4+dfsg-1build14.99.4+dfsg+really4.10.0+py3-24.99.4+dfsg+really4.11.2-14.99.4+dfsg+really4.11.2-1build14.99.4+dfsg+really4.12.0-14.99.4+dfsg+really4.12.0-1build14.99.4+dfsg+really4.12.0-1ubuntu1	None known
`calibre` Ubuntu:22.04:LTS	All versions, plus listed versions 5.25.0+dfsg-25.33.2+dfsg-15.34.0+dfsg-15.35.0+dfsg-1ubuntu25.37.0+dfsg-15.37.0+dfsg-1build1	None known
`calibre` Ubuntu:24.04:LTS	All versions, plus listed versions 6.24.0+ds-16.29.0+ds-17.0.0+ds-17.1.0+ds-17.1.0+ds-2 Show 9 moreShow less 7.2.0+ds-17.2.0+ds-1build17.3.0+ds-17.4.0+ds-17.5.1+ds-17.5.1+ds-27.5.1+ds-37.6.0+ds-17.6.0+ds-1build1	None known
`calibre` Ubuntu:25.10	All versions, plus listed versions 7.26.0+ds-4build18.3.0+ds-18.4.0+ds-18.5.0+ds-18.6.0+ds-1 Show 4 moreShow less 8.7.0+ds-18.8.0+ds-28.8.0+ds-38.8.0+ds-3build1	None known
`calibre` Ubuntu:26.10	All versions, plus listed versions 9.2.1+ds+~0.10.5-2build19.9.0+ds+~0.10.6-19.11.0+ds+~0.10.6-19.11.0+ds+~0.10.6-29.13.0+ds+~0.10.6-19.14.0+ds+~0.10.6-2build1	None known
`calibre` Ubuntu:26.04:LTS	All versions, plus listed versions 8.8.0+ds-3build18.13.0+ds+~0.10.5-38.14.0+ds+~0.10.5-18.15.0+ds+~0.10.5-18.16.0+ds+~0.10.5-2 Show 4 moreShow less 8.16.2+ds+~0.10.5-18.16.2+ds+~0.10.5-28.16.2+ds+~0.10.5-39.2.1+ds+~0.10.5-2build1	None known
`calibre` openSUSE:Tumbleweed From an advisory covering 10 CVEs	before 9.7.0-1.1	9.7.0-1.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-30853 is a medium vulnerability (CVSS 5.0) in Calibre-ebook Calibre, published March 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 8th percentile. Fixed in calibre 6.13.0+repack-2+deb12u8.

References

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