CVE-2026-33899 ImageMagick: Heap BufferOverflow write of single zero byte when parsing XML

What is CVE-2026-33899?

CVE-2026-33899 is a medium-severity memory corruption 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 7.1.2-189 and 6.9.13-44, when `Magick` parses an XML file it is possible that a single zero byte is written out of the bounds. This issue has been fixed in versions 6.9.13-44 and 7.1.2-19.

Weakness: CWE-191, CWE-122

Which versions are affected by CVE-2026-33899?

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-2026-33899?

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-2026-33899 being exploited?

There is no known exploitation of CVE-2026-33899 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-2026-33899, ECHO-7a8d-b09b-d4c9, GHSA-cr67-pvmx-2pp2, JLSEC-2026-993, MINI-h2xv-rj6v-x65f, UBUNTU-CVE-2026-33899.