CVE-2026-33900 ImageMagick has a Heap overflow caused by integer overflow/wraparound in viff encoder on 32-bit builds

What is CVE-2026-33900?

CVE-2026-33900 is a medium-severity vulnerability in Imagemagick Imagemagick, published on 13 Apr 2026. An attacker can exploit it over the internet without logging in, 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 both 7.1.2-19 and 6.9.13-44, the viff encoder contains an integer truncation/wraparound issue on 32-bit builds that could trigger an out of bounds heap write, potentially causing a crash. This issue has been fixed in versions 6.9.13-44 and 7.1.2-19.

Weakness: CWE-190

Which versions are affected by CVE-2026-33900?

12 open source packages ship an affected version, including Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU and Magick.NET-Q16-HDRI-x86. It affects 1 product.

Products include Imagemagick Imagemagick.

How do I fix CVE-2026-33900?

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

Is CVE-2026-33900 being exploited?

There is no known exploitation of CVE-2026-33900 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-2026-33900, ECHO-ee9f-e0b6-7a61, GHSA-v67w-737x-v2c9, JLSEC-2026-994, MINI-26p9-fpcq-f92w, UBUNTU-CVE-2026-33900.