# CVE-2026-105080: ConvertX unsafe recipe file handling in Calibre converter

Source: https://junglewise.ai/threats/cve-2026-105080-in-convertx-before-0-19-0-converters-calibre-ts-does-not-block  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-03. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-105080 · Severity: critical · CVSS 9.9 · Published 2026-10-03

ConvertX is a file conversion application that integrates with Calibre for ebook format conversions. Versions before 0.19.0 fail to block malicious recipe files (.recipe and .downloaded_recipe), which are passed directly to Calibre's ebook-convert tool where they can execute arbitrary code. An attacker could exploit this by uploading or providing a specially crafted recipe file, gaining code execution on the server.

Technologies: [ConvertX](https://junglewise.ai/threats/technologies/convertx-convertx). Vendors: [ConvertX](https://junglewise.ai/threats/vendors/convertx).

## Quick answers

**Is CVE-2026-105080 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105080 being exploited in the wild.

**How severe is CVE-2026-105080?** Critical severity, with a CVSS score of 9.9, published 3 October 2026.

**Which products and versions are affected?** ConvertX before 0.19.0.

**Is there a fix for CVE-2026-105080?** Yes: fixed in 0.19.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-105080 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-105080?** Check whether you run ConvertX at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 0.19.0

## Technical details

The vulnerability exists in converters/calibre.ts, which does not validate or filter recipe file inputs before passing them to the ebook-convert program. Recipe files (.recipe and .downloaded_recipe) can contain executable code that Calibre will interpret during conversion. An attacker with the ability to upload or supply files to ConvertX can achieve remote code execution through a malicious recipe file without authentication or user interaction beyond the file submission.

## Affected products

- ConvertX ConvertX before 0.19.0

## Timeline

- 2026-10-03: disclosed
- 2026-09-26: patched

## References

- [https://github.com/C4illin/ConvertX/commit/0ca17dad7fa65e2e34823b59b95dd00bb1066b66](https://github.com/C4illin/ConvertX/commit/0ca17dad7fa65e2e34823b59b95dd00bb1066b66)
- [https://github.com/C4illin/ConvertX/releases/tag/v0.19.0](https://github.com/C4illin/ConvertX/releases/tag/v0.19.0)

## Related threats

- [ConvertX path traversal in ImageMagick converter](https://junglewise.ai/threats/cve-2026-59976-convertx-is-a-self-hosted-file-conversion-service-prior-to-0-18-0)
- [ConvertX arbitrary file read vulnerability in Pandoc converter](https://junglewise.ai/threats/cve-2026-108694-convertx-through-0-19-0-contains-an-arbitrary-file-read)