What’s Vulnerable › Vulnerabilities

CVE-2026-25794: ImageMagick has heap-buffer-overflow via signed integer overflow in `WriteUHDRImage` when writing UHDR images with large dimensions

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-24 · updated 2026-07-15
• Weakness: CWE-122

Description

ImageMagick is free and open-source software used for editing and manipulating digital images. `WriteUHDRImage` in `coders/uhdr.c` uses `int` arithmetic to compute the pixel buffer size. Prior to version 7.1.2-15, when image dimensions are large, the multiplication overflows 32-bit `int`, causing an undersized heap allocation followed by an out-of-bounds write. This can crash the process or potentially lead to an out of bounds heap write. Version 7.1.2-15 contains a patch.

Affected products

• ImageMagick: before 7.1.2-15 — fixed in 7.1.2-15

How to fix

Upgrade to a fixed version: ImageMagick 7.1.2-15. Check the vendor advisory for mitigations.

References

• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-vhqj-f5cj-9x8h
• https://access.redhat.com/security/cve/CVE-2026-25794
• https://bugzilla.redhat.com/show_bug.cgi?id=2442110
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25794.json

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