What is CVE-2026-105080?

CVE-2026-105080 is a critical-severity vulnerability in C4illin Convertx, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 9.9/10. Published 2026-10-03.

How severe is CVE-2026-105080?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Vulnerability in C4illin Convertx

CVE-2026-105080

In ConvertX before 0.19.0, converters/calibre.ts does not block recipe files, and instead passes them to the ebook-convert program from Calibre. This affects executable code in a .recipe or .downloaded_recipe file.

Published 2026-10-03.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

Frequently asked questions

What is CVE-2026-105080?: CVE-2026-105080 is a critical-severity vulnerability in C4illin Convertx, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 9.9/10. Published 2026-10-03.
How severe is CVE-2026-105080?: Critical severity. CVSS v3 base score is 9.9 out of 10.