What’s Vulnerable › Vulnerabilities

CVE-2026-56361: ImageMagick - Heap Buffer Overflow via Off-by-One in Morphology Processing

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-30 · updated 2026-10-29
• Weakness: CWE-125

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.

Affected products

• ImageMagick: before 6.9.13-44; from 7.0.0-0 before 7.1.2-19 — fixed in 6.9.13-44, 7.1.2-19
• ImageMagick: from 7.0.0 before 7.1.2-19 — fixed in 7.1.2-19

How to fix

Upgrade to a fixed version: ImageMagick 6.9.13-44, 7.1.2-19; ImageMagick 7.1.2-19. Check the vendor advisory for mitigations.

References

• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-q8h3-jv9v-57qx
• https://www.vulncheck.com/advisories/imagemagick-heap-buffer-overflow-via-off-by-one-in-morphology-processing

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