Heap buffer overflow in EMF+ gradient brush import (CVE-2026-6045) | HOL Guard CVE

Medium · CVSS 5.4CVE-2026-6045

Heap buffer overflow in EMF+ gradient brush import

Answer in brief

CVE-2026-6045 records a Medium severity (CVSS 5.4) vulnerability in Heap buffer overflow in EMF+ gradient brush import. The current sources do not mark it as known exploited. The current feed maps The Document Foundation/LibreOffice (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 Jun 15, 2026Updated Sep 28, 2026Source checked Sep 28, 2026First seen by HOL Sep 28, 2026Material review Sep 28, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.4
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.4. 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 The Document Foundation/LibreOffice (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
The Document Foundation/LibreOfficegeneric	>=25.8 <<25.8.7 \|\| >=26.2 <<26.2.3	< 25.8.7, < 26.2.3, <25.8.7, <26.2.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for The Document Foundation/LibreOffice.
Review the reported fix. Update The Document Foundation/LibreOffice to < 25.8.7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 28, 2026

Sources and claim methodology

Source referencelibreoffice.org

Upstream source description

LibreOffice can import EMF+ graphics, which may be embedded in documents. A heap buffer overflow existed when importing an EMF+ gradient brush. The number of gradient blend points was read from the file and used to compute an allocation size, but that multiplication could overflow, so a small buffer was allocated and then filled as if it were large, writing past its end. In fixed versions the blend-point count is checked against the data actually available before allocating.

Quoted source text, attributed separately from HOL analysis.