CVE-2026-56373 ImageMagick - Use-After-Free Write in PDB Decoder

What is CVE-2026-56373?

CVE-2026-56373 is a medium-severity use after free vulnerability in Imagemagick Imagemagick, published on 10 Jul 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 contains a use-after-free vulnerability in the PDB decoder that uses a stale pointer when memory allocation fails. Attackers can trigger this vulnerability by processing malicious PDB files to cause crashes or write a single zero byte to freed memory.

Weakness: CWE-416

Which versions are affected by CVE-2026-56373?

38 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-2026-56373?

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-2026-56373 being exploited?

There is no known exploitation of CVE-2026-56373 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-2026-56373, ECHO-a17a-4028-5497, GHSA-3j4x-rwrx-xxj9, GHSA-j6f7-9c5w-9r2q, JLSEC-2026-1054, MINI-hch6-9fj2-7mvj and 1 more.