Vulnerability · Published Mar 13, 2026 · Assigned by GitHub_M
CVE-2026-30853calibre has a Path Traversal Leading to Arbitrary File Write
Medium 5.0
In plain English
A medium-severity path traversal in calibre from kovidgoyal. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | calibre | 6.13.0+repack-2+deb12u8 | DEBIAN-CVE-2026-30853 |
| Debian:13 | calibre | 8.5.0+ds-1+deb13u3 | DEBIAN-CVE-2026-30853 |
| Debian:14 | calibre | 9.5.0+ds+~0.10.5-1 | DEBIAN-CVE-2026-30853 |
| Ubuntu:22.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-30853 |
| Ubuntu:24.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-30853 |
| Ubuntu:25.10 | calibre | no fix listed | UBUNTU-CVE-2026-30853 |
| Ubuntu:26.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-30853 |
| Ubuntu:26.10 | calibre | no fix listed | UBUNTU-CVE-2026-30853 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| kovidgoyal | calibre | < 9.5.0 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
References
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542x x_refsource_CONFIRM