What’s Vulnerable › Vulnerabilities

CVE-2026-86421: ImageMagick before 7.1.2-30 Memory Leak via MSL decoder

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-07 · updated 2026-10-29
• Weakness: CWE-400

Description

ImageMagick before 7.1.2-30 and 6.9.13-55 contains a memory leak in the MSL image decoder. A crafted MSL image triggers memory allocation without proper deallocation, allowing an attacker to exhaust memory and cause a denial of service.

Affected products

• ImageMagick: before 6.9.13-55; from 7.0.0-0 before 7.1.2-30 — fixed in 6.9.13-55, 7.1.2-30
• ImageMagick: from 7.0.0 before 7.1.2-30 — fixed in 7.1.2-30

How to fix

Upgrade to a fixed version: ImageMagick 6.9.13-55, 7.1.2-30; ImageMagick 7.1.2-30. Check the vendor advisory for mitigations.

References

• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-4jv7-q6xw-6f4x
• https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-30-memory-leak-via-msl-decoder

Get alerted when CVE-2026-86421 or the next vulnerability affects your stack