CVE-2026-56366 ImageMagick - Memory Leak in META Reader APP1JPEG Error Path

What is CVE-2026-56366?

CVE-2026-56366 is a medium-severity denial of service vulnerability in Imagemagick Imagemagick, published on 10 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

ImageMagick before 7.1.2-18 contains a memory leak vulnerability in the META reader when processing APP1JPEG input paths. Attackers can trigger this memory leak by providing specially crafted APP1JPEG image files, causing denial of service through resource exhaustion.

Weakness: CWE-401

Which versions are affected by CVE-2026-56366?

36 open source packages ship an affected version, including Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU and Magick.NET-Q16-HDRI-OpenMP-arm64. It affects 1 product.

Products include Imagemagick Imagemagick.

How do I fix CVE-2026-56366?

Upgrade Magick.NET-Q16-AnyCPU to 14.11.1 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-56366 being exploited?

There is no known exploitation of CVE-2026-56366 in the wild and no public exploit code.

Other vulnerabilities in Imagemagick Imagemagick

• CVE-2019-19952 Use after free in n/a Critical 9.8
• CVE-2018-16328 Null dereference in n/a Critical 9.8
• CVE-2018-16329 Null dereference in n/a Critical 9.8
• CVE-2017-18210 Null dereference in n/a Critical 9.8
• CVE-2017-14138 Denial of service in n/a Critical 9.8

All Imagemagick Imagemagick vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-56366, ECHO-822f-c526-ce25, GHSA-377p-xr9w-8773, GHSA-9r56-3gjq-hqf7, JLSEC-2026-1047, MINI-jp3m-v67h-f93p and 1 more.