CVE-2026-56361 ImageMagick - Heap Buffer Overflow via Off-by-One in Morphology Processing

What is CVE-2026-56361?

CVE-2026-56361 is a medium-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 30 Jun 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 7.1.2-19 contains an off-by-one error in morphology validation allowing out-of-bounds heap buffer reads. Attackers can trigger heap buffer overflow by providing incorrect morphology parameters causing single pixel memory access violations.

Weakness: CWE-125

Which versions are affected by CVE-2026-56361?

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-2026-56361?

Upgrade Magick.NET-Q16-AnyCPU to 14.12.0 or later.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-56361 being exploited?

There is no known exploitation of CVE-2026-56361 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-2026-56361, ECHO-9d87-2ca9-c2b3, GHSA-4h5w-9gq6-38f8, GHSA-q8h3-jv9v-57qx, JLSEC-2026-1042, MINI-45j6-38w7-2p4m and 1 more.