What’s Vulnerable › Vulnerabilities

CVE-2026-33900: ImageMagick has a Heap overflow caused by integer overflow/wraparound in viff encoder on 32-bit builds

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-13 · updated 2026-06-17
• Weakness: CWE-190

Description

ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below both 7.1.2-19 and 6.9.13-44, the viff encoder contains an integer truncation/wraparound issue on 32-bit builds that could trigger an out of bounds heap write, potentially causing a crash. This issue has been fixed in versions 6.9.13-44 and 7.1.2-19.

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

How to fix

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

References

• https://github.com/ImageMagick/ImageMagick/commit/d27b840a61b322419a66d0d192ff56d52498148d
• https://github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-19
• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-v67w-737x-v2c9
• https://github.com/dlemstra/Magick.NET/releases/tag/14.12.0

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