CVE-2026-56365 ImageMagick - Memory Leak in PNG Encoder via MNG Image Writing

What is CVE-2026-56365?

CVE-2026-56365 is a medium-severity denial of service vulnerability in Imagemagick Imagemagick, published on 30 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

ImageMagick before 7.1.2-19 contains a memory leak vulnerability in the PNG encoder when writing MNG images. Attackers can trigger the encoder failure condition to exhaust memory resources and cause denial of service.

Weakness: CWE-401

Which versions are affected by CVE-2026-56365?

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-2026-56365?

Upgrade Magick.NET-Q16-AnyCPU to 14.12.0 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-2026-56365 being exploited?

There is no known exploitation of CVE-2026-56365 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-2026-56365, ECHO-7785-a7f7-b889, GHSA-hq73-7c65-p9cq, GHSA-x928-4434-crqj, JLSEC-2026-1046, MINI-55pg-737r-8rhw and 1 more.