# CVE-2026-104066: Scribus heap buffer overflow in Mac PICT image loader

Source: https://junglewise.ai/threats/cve-2026-104066-scribus-before-1-6-7-contains-a-heap-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-30. Updated: 2026-10-30  
License: CC BY 4.0 with a link back

CVE-2026-104066 · Severity: high · CVSS 7.8 · Published 2026-10-30

Scribus is a desktop publishing application used to create professional documents and layouts. A heap buffer overflow in its Mac PICT image importer can be triggered when a user places or imports a specially crafted PICT image file, potentially allowing an attacker to crash the application or execute arbitrary code.

Technologies: [Scribus Project Scribus](https://junglewise.ai/threats/technologies/scribus). Vendors: [Scribus Project](https://junglewise.ai/threats/vendors/scribus-project).

## Quick answers

**Is CVE-2026-104066 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104066 being exploited in the wild.

**How severe is CVE-2026-104066?** High severity, with a CVSS score of 7.8, published 30 October 2026.

**Which products and versions are affected?** Scribus Project Scribus before 1.6.7.

**Is there a fix for CVE-2026-104066?** Yes: fixed in Scribus 1.6.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-104066 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-104066?** Check whether you run Scribus Project Scribus 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 Scribus 1.6.7

## Technical details

A heap buffer overflow exists in the Mac PICT image loader when unpacking 4-bit indexed pixel data, caused by inconsistent width and row data validation. The vulnerability is in the import plugin's image data loader component and can be triggered via a maliciously crafted PICT file with no authentication or user interaction required beyond importing the file. The issue allows out-of-bounds writes leading to crashes or code execution.

## Affected products

- Scribus Project Scribus before 1.6.7

## Timeline

- 2026-10-30: disclosed

## References

- [https://github.com/scribusproject/scribus](https://github.com/scribusproject/scribus)
- [https://github.com/scribusproject/scribus/commit/d667b3b1d38e1808721315dc976d67b72070f6b4](https://github.com/scribusproject/scribus/commit/d667b3b1d38e1808721315dc976d67b72070f6b4)

## Related threats

- [Scribus out-of-bounds memory access in importsvm plugin](https://junglewise.ai/threats/cve-2026-104067-scribus-before-1-6-7-contains-an-out-of-bounds-memory-access)
- [Scribus out-of-bounds write in Micrografx Draw import](https://junglewise.ai/threats/cve-2026-104065-scribus-before-1-6-7-contains-an-out-of-bounds-write)
- [Scribus integer overflow in TIFF loader](https://junglewise.ai/threats/cve-2026-104064-scribus-before-1-6-7-contains-an-integer-overflow-vulnerability)
- [Scribus heap out-of-bounds write in PSD loader](https://junglewise.ai/threats/cve-2026-104061-scribus-before-1-6-7-contains-a-heap-out-of-bounds-write)