Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| kovidgoyal | calibre | < 9.5.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | calibre | 9.5.0+ds+~0.10.5-1 | — |
| Debian 13 | calibre | 8.5.0+ds-1+deb13u3 | — |
| Debian 12 | calibre | 6.13.0+repack-2+deb12u8 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | calibre | No fix yet | — |
| Ubuntu 26.04 LTS | calibre | No fix yet | — |
| Ubuntu 25.10 | calibre | No fix yet | — |
| Ubuntu 24.04 LTS | calibre | No fix yet | — |
| Ubuntu 22.04 LTS | calibre | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | calibre | No fix yet | — |
| Ubuntu 18.04 LTS | calibre | No fix yet | — |
| Ubuntu 16.04 LTS | calibre | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | calibre | 9.7.0-1.1 | openSUSE-SU-2026:10587-1 |
Advisories 1
- openSUSE-SU-2026:10587-1 calibre-9.7.0-1.1 on GA media SUSE / openSUSE Security Updates · Apr 22, 2026