CVE-2026-56376 ImageMagick - Heap Use-After-Free in Meta Coder

What is CVE-2026-56376?

CVE-2026-56376 is a medium-severity use after free vulnerability in Imagemagick Imagemagick, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

ImageMagick before 7.1.2-15 and 6.9.13-40 contains a heap use-after-free in the meta coder: when memory allocation fails, a single byte is written to a stale pointer. Remote attackers can trigger it by processing specially crafted image files, causing a denial of service.

Weakness: CWE-416

Which versions are affected by CVE-2026-56376?

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-2026-56376?

Upgrade Magick.NET-Q16-AnyCPU to 14.10.3 or later.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2026-56376 being exploited?

There is no known exploitation of CVE-2026-56376 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
• How this page is made

Also known as DEBIAN-CVE-2026-56376, ECHO-6170-c952-1e0b, GHSA-2gq3-ww97-wfjm, JLSEC-2026-1057, MINI-786r-rxvg-q7jx, UBUNTU-CVE-2026-56376.