CVE-2026-25970 ImageMagick SIXEL Decoder Has Signed Integer Overflow, Leading to Memory Corruption

What is CVE-2026-25970?

CVE-2026-25970 is a medium-severity vulnerability in Imagemagick Imagemagick, published on 24 Feb 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. Prior to versions 7.1.2-15 and 6.9.13-40, a signed integer overflow vulnerability in ImageMagick's SIXEL decoder allows an attacker to trigger memory corruption and denial of service when processing a maliciously crafted SIXEL image file. The vulnerability occurs during buffer reallocation operations where pointer arithmetic using signed 32-bit integers overflows. Versions 7.1.2-15 and 6.9.13-40 contain a patch.

Weakness: CWE-190

Which versions are affected by CVE-2026-25970?

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-2026-25970?

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

Is CVE-2026-25970 being exploited?

There is no known exploitation of CVE-2026-25970 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-2026-1774283917, CLSA-2026-1774370188, DEBIAN-CVE-2026-25970, ECHO-47e1-8fa8-b833, GHSA-xg29-8ghv-v4xr, JLSEC-2026-957 and 2 more.