CVE-2026-56362 imagemagick vulnerability
ImageMagick before 7.1.2-15 contains a heap-buffer-overflow read vulnerability in GetPixelIndex caused by OpenPixelCache updating image channel metadata before pixel cache memory allocation. Attackers can trigger memory and disk allocation failures to cause a heap-buffer-overflow read affecting any writer calling GetPixelIndex.
Quick answer
imagemagick should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-56362 affects ImageMagick installations before the patched release listed in the official advisory. The issue involves pixel cache and GetPixelIndex handling, where crafted image processing input can trigger a heap-buffer-overflow read, denial of service, crash, or information disclosure. Prioritize systems that accept public uploads, transform user-supplied images, or run ImageMagick in web workers and background jobs. The official remediation is to update to ImageMagick 7.1.2-15, 6.9.13-40, or a later vendor-supported release for the installed branch; if patching must wait, isolate image conversion and reject untrusted formats that reach the vulnerable path.
- Inventory every ImageMagick installation in application servers, build images, serverless functions, worker containers, and CI utilities.
- Identify whether the installed ImageMagick branch is older than ImageMagick 7.1.2-15, 6.9.13-40, or a later vendor-supported release for the installed branch.
- Update OS packages, container base images, or source builds to ImageMagick 7.1.2-15, 6.9.13-40, or a later vendor-supported release for the installed branch, then redeploy all services that bundle the library.
- Restrict public image upload and conversion workflows until the patched binary is active in production.
- Disable or block high-risk coders and formats that are not required by the application, especially where untrusted users control input files.
- Run image processing under a low-privilege account with resource limits, temporary storage limits, and process isolation.
- Review application, worker, and crash logs for repeated conversion failures or suspicious image files and preserve samples for incident review.
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Verify the fix
- Confirm the production binary reports ImageMagick 7.1.2-15, 6.9.13-40, or a later vendor-supported release for the installed branch or a later supported version in every runtime image.
- Confirm package lockfiles, SBOMs, and container layers no longer include the vulnerable ImageMagick build.
- Process a safe test image through each conversion path and confirm workers complete normally under the new version.
- Rerun a Fixnx scan for public upload or media processing pages where exposure is website-visible.
- Document updated package versions, deployed image digests, and the log review outcome.
Trusted references
FAQ
What is affected by CVE-2026-56362?
imagemagick should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.