CVE-2026-40169 ImageMagick: Heap buffer overflow (WRITE) in the YAML and JSON encoders

What is CVE-2026-40169?

CVE-2026-40169 is a medium-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 13 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below 7.1.2-19, a crafted image could result in an out of bounds heap write when writing a yaml or json output, resulting in a crash. This issue has been fixed in version 7.1.2-19.

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2026-40169?

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-2026-40169?

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-2026-40169 being exploited?

There is no known exploitation of CVE-2026-40169 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 CLSA-2026-1777477457, CLSA-2026-1777478310, DEBIAN-CVE-2026-40169, GHSA-5592-p365-24xh, JLSEC-2026-1000, MINI-rr32-55gr-jpjp and 1 more.