CVE-2026-56363: 
ImageMagick vulnerability analysis and mitigation

CVE-2026-56363 is a division-by-zero vulnerability in ImageMagick's binomial kernel processing that allows local attackers to cause a denial of service (application crash). It affects ImageMagick versions before 7.1.2-22 (7.x branch) and before 6.9.13-47 (6.x branch). The vulnerability was published on June 30, 2026, with a patch released in ImageMagick 7.1.2-22 and 6.9.13-47. It carries a CVSS v3.1 base score of 3.3 (Low) and a CVSS v4.0 base score of 4.8 (Medium) (GitHub Advisory, Github Advisory).

The root cause is an integer overflow (CWE-190) combined with a divide-by-zero condition (CWE-369) in the binomial kernel processing code. When a user supplies an excessively large binomial kernel value, the resulting integer overflow causes a downstream calculation to produce a zero divisor, triggering a division-by-zero error and crashing the application. Exploitation requires local access and user interaction — specifically, a victim must process a maliciously crafted input through ImageMagick. The vulnerability was reported by researcher '007bsd' (GitHub Advisory).

Successful exploitation results in an application crash, causing a denial of service limited to the availability of the ImageMagick process. There is no impact on confidentiality or data integrity, and the scope is unchanged — meaning the crash does not propagate beyond the affected ImageMagick instance. The impact is particularly relevant in environments where ImageMagick is used as a backend image processing service, where repeated crashes could disrupt service availability (Github Advisory, GitHub Advisory).

1. Identify a target: Locate a system running ImageMagick before version 7.1.2-22 (7.x) or 6.9.13-47 (6.x) that processes user-supplied image or kernel inputs.
2. Craft a malicious input: Prepare an input that specifies an excessively large binomial kernel value — large enough to trigger an integer overflow during internal kernel size calculations.
3. Submit the input: Supply the crafted input to ImageMagick, either directly via command-line invocation or through an application that passes user-controlled data to ImageMagick's image processing pipeline.
4. Trigger the crash: The integer overflow causes a downstream division-by-zero in the binomial kernel processing routine, resulting in an application crash and denial of service (GitHub Advisory).

• Logs: Unexpected ImageMagick process termination errors or crash reports in application logs; error messages referencing division by zero or floating-point exceptions in system logs (e.g., SIGFPE signals).
• Process: Abnormal termination of ImageMagick worker processes; repeated restarts of image processing services or daemons that invoke ImageMagick.
• File System: Presence of core dump files generated by a crashed ImageMagick process in the working directory or configured core dump path.

Upgrade ImageMagick to version 7.1.2-22 or later (7.x branch) or 6.9.13-47 or later (6.x branch) to remediate the vulnerability. As a workaround, implement input validation to restrict the range of binomial kernel values accepted before passing them to ImageMagick. Linux distribution users should apply vendor-provided security updates; patches have been issued for Debian and SUSE (GitHub Advisory, SUSE Advisory).

The vulnerability was assigned low-to-moderate severity by the ImageMagick maintainers and patched promptly. Linux distribution vendors including Debian and SUSE issued security update announcements incorporating the fix. No significant researcher commentary or broader media coverage has been observed beyond standard vulnerability tracking and distribution security advisories.