Vulnerability · Published Mar 27, 2026 · Assigned by GitHub_M
CVE-2026-33206calibre has a path traversal vulnerability
High 8.2
In plain English
A high-severity security flaw 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 12% 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 version 9.6.0, a path traversal vulnerability exists in Calibre' handling of images in Markdown and other similar text-based files allowing an attacker to include arbitrary files from the file system into the converted book. Additionally, missing authentication and server-side request forgery in the background-image endpoint in the ebook reader web view allow the files to be exfiltrated without additional interaction. Version 9.6.0 contains a fix.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | calibre | 6.13.0+repack-2+deb12u8 | DEBIAN-CVE-2026-33206 |
| Debian:13 | calibre | 8.5.0+ds-1+deb13u3 | DEBIAN-CVE-2026-33206 |
| Debian:14 | calibre | 9.6.0+ds+~0.10.5-1 | DEBIAN-CVE-2026-33206 |
| Ubuntu:22.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-33206 |
| Ubuntu:24.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-33206 |
| Ubuntu:25.10 | calibre | no fix listed | UBUNTU-CVE-2026-33206 |
| Ubuntu:26.04:LTS | calibre | no fix listed | UBUNTU-CVE-2026-33206 |
| Ubuntu:26.10 | calibre | no fix listed | UBUNTU-CVE-2026-33206 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| kovidgoyal | calibre | < 9.6.0 |
Weakness: CWE-23 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
References
- https://github.com/kovidgoyal/calibre/security/advisories/GHSA-h3p4-m74f-43g6 x_refsource_CONFIRM