Path Traversal in C4illin Convertx
CVE-2026-59976
ConvertX is a self-hosted file conversion service. Prior to 0.18.0, the ImageMagick converter uses the unsanitized convert_to parameter to construct an output path. If an authenticated user, or an unauthenticated user when ConvertX is configured to allow unauthenticated access, uploads an extensionless image and supplies directory traversal sequences in convert_to through /convert, the constructed path escapes the intended output directory, allowing the attacker to write converted output to arbitrary container paths, potentially overwriting files or causing denial of service. This issue is fixed in version 0.18.0.
Vulnerability class: Path Traversal (Directory Traversal)
Published .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- C4illin Convertx — versions < 0.18.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-59976?
- CVE-2026-59976 is a high-severity vulnerability in C4illin Convertx, classified under Path Traversal. CVSS score: 8.1/10. Published 2026-10-12.
- How severe is CVE-2026-59976?
- High severity. CVSS v3 base score is 8.1 out of 10.