High · CVSS 8.5CVE-2026-104066

Scribus before 1.6.7 Heap Buffer Overflow via PICT 4-bit Pixel UnpackingCVE-2026-104066

Answer in brief

CVE-2026-104066 records a High severity (CVSS 8.5) vulnerability in Scribus before 1.6.7 Heap Buffer Overflow via PICT 4-bit Pixel Unpacking. The current sources do not mark it as known exploited. The current feed maps Scribus/Scribus (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 30, 2026Updated Oct 30, 2026Source checked Oct 30, 2026First seen by HOL Oct 30, 2026Material review Oct 30, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Scribus/Scribus (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Scribus/Scribusgeneric	>=0 <1.6.7	1.6.7

Recommended response

Check inventory. Check lockfiles and deployed manifests for Scribus/Scribus.
Review the reported fix. Update Scribus/Scribus to 1.6.7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 30, 2026

Sources and claim methodology

Upstream source description

Scribus before 1.6.7 contains a heap buffer overflow vulnerability in the Mac PICT image loader and import plugin when unpacking 4-bit indexed pixel data. Attackers can supply a crafted PICT file with inconsistent width and row data that, when placed or imported, writes out of bounds, causing crashes or code execution.

Quoted source text, attributed separately from HOL analysis.