Relative Path Traversal in Calibre - CVE-2026-33206
Published: June 29, 2026
Vulnerability identifier: #VU135815
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33206
CWE-ID: CWE-23
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Calibre
Affected software:
Calibre
Calibre
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to path traversal in the image handling logic of txt_input.py when converting markdown or other text-based files. A remote attacker can supply a specially crafted file containing traversal sequences in image references to disclose sensitive information.
User interaction is required to open or convert a crafted text-based file, and the issue can cause arbitrary readable local files to be included in the generated ebook.
How to mitigate CVE-2026-33206
Install security update from vendor's website.