CVE-2026-61866 ImageMagick before 7.1.2-26 Memory Leak in JNG encoder

What is CVE-2026-61866?

CVE-2026-61866 is a low-severity denial of service vulnerability in Imagemagick Imagemagick, published on 15 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

ImageMagick before 7.1.2-26 contains a memory leak vulnerability in the JNG encoder when a blob cannot be opened. Attackers can trigger the memory leak by providing malformed JNG files that fail blob operations, causing resource exhaustion.

Weakness: CWE-401

Which versions are affected by CVE-2026-61866?

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-2026-61866?

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-2026-61866 being exploited?

There is no known exploitation of CVE-2026-61866 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 CLSA-2026-1784298569, CLSA-2026-1784299439, CLSA-2026-1784719414, CLSA-2026-1784808556, CLSA-2026-1784809847, CLSA-2026-1784810162 and 11 more.