Medium · CVSS 4.8CVE-2026-56361

ImageMagick - Heap Buffer Overflow via Off-by-One in Morphology ProcessingCVE-2026-56361

Answer in brief

CVE-2026-56361 records a Medium severity (CVSS 4.8) vulnerability in ImageMagick - Heap Buffer Overflow via Off-by-One in Morphology Processing. The current sources do not mark it as known exploited. The current feed maps ImageMagick/ImageMagick (generic), ImageMagick/ImageMagick (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 30, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Jul 1, 2026Material review Oct 29, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 4.8. 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 ImageMagick/ImageMagick (generic), ImageMagick/ImageMagick (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
ImageMagick/ImageMagickgeneric	>=7.0.0 <7.1.2-19	7.1.2-19
ImageMagick/ImageMagickgeneric	>=0 <6.9.13-44	6.9.13-44

Recommended response

Check inventory. Check lockfiles and deployed manifests for ImageMagick/ImageMagick, ImageMagick/ImageMagick.
Review the reported fix. Update ImageMagick/ImageMagick to 7.1.2-19; ImageMagick/ImageMagick to 6.9.13-44 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 1, 2026

Sources and claim methodology

Upstream source description

ImageMagick before 7.1.2-19 contains an off-by-one error in morphology validation allowing out-of-bounds heap buffer reads. Attackers can trigger heap buffer overflow by providing incorrect morphology parameters causing single pixel memory access violations.

Quoted source text, attributed separately from HOL analysis.

MariaDB Connector/J: Rogue server can make the client read past the packet through server-declared lengthsAlso CWE-125