CVE-2026-66011 ImageMagick before 7.1.2-27 Memory Leak via Invalid CLI Options

What is CVE-2026-66011?

CVE-2026-66011 is a medium-severity denial of service vulnerability in Imagemagick Imagemagick, published on 25 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 7.1.2-27 contains a memory leak vulnerability in the magick command-line interface when invalid options are provided. Attackers can trigger memory exhaustion by repeatedly supplying malformed command-line arguments to consume system resources.

Weakness: CWE-401

Which versions are affected by CVE-2026-66011?

34 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-2026-66011?

Upgrade Magick.NET-Q16-AnyCPU to 14.15.0 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-2026-66011 being exploited?

There is no known exploitation of CVE-2026-66011 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-2026-66011, ECHO-f4e4-6b33-9609, GHSA-c28x-m839-79fq, GHSA-cvhv-g4rq-3hmw, JLSEC-2026-1083, MINI-gh9f-h2pg-6xcp and 3 more.