CVE-2026-62363

What it actually does

ImageMagick versions before 7.1.2-27 contain a heap buffer overwrite in the `fx` image operation when processing a crafted argument. Exploitation requires an attacker to influence an ImageMagick command or workflow that invokes `-fx`/FX expression handling, and the CVSS vector indicates local access, low privileges, and user interaction are required. The primary technical consequence is process memory corruption that can crash the ImageMagick process or dependent application, causing denial of service; confidentiality and integrity impact are not indicated by the published scoring.

Why it matters to the business

Systems and applications that process untrusted images or user-controlled ImageMagick arguments may be vulnerable to service disruption. The most likely business outcome is failed image processing, worker crashes, queue backlogs, degraded user experience, or temporary outage of services that rely on ImageMagick for thumbnails, conversions, previews, or media ingestion. The issue is not currently listed in CISA KEV, has low EPSS, and has no public exploit maturity reported, but remediation should still be prioritized for internet-facing or multi-tenant image-processing pipelines because ImageMagick is widely embedded in downstream software and automation.

How an attack unfolds

An attacker first identifies a workflow where ImageMagick is installed and where they can influence image-processing input or arguments. They then supply a crafted FX expression or file-processing request that causes ImageMagick to execute the vulnerable `fx` operation. When a vulnerable version prior to 7.1.2-27 evaluates the crafted argument, it can write past the bounds of a heap buffer. In practical terms, this is expected to terminate or destabilize the ImageMagick process or the application worker invoking it, resulting in denial of service. Successful exploitation depends on the application exposing or internally constructing `fx` operations from attacker-controlled input; simple image upload alone may not be sufficient unless the processing pipeline uses FX expressions.

How to fix it

Upgrade ImageMagick to version 7.1.2-27 or later wherever it is installed, including packaged operating-system builds, containers, CI images, serverless layers, desktop tooling, and bundled copies embedded in applications. If immediate upgrade is not possible, reduce exposure by preventing untrusted users from supplying ImageMagick command-line options or FX expressions, disabling or removing workflows that invoke `-fx` on untrusted input, enforcing strict allowlists for image operations, running ImageMagick in a sandbox with CPU/memory/time limits, and isolating image-processing workers from critical services. Rebuild and redeploy dependent containers or applications after upgrading the underlying ImageMagick package.

How to confirm the fix worked

Confirm remediation by running `magick -version` or the package manager equivalent and verifying the installed ImageMagick version is 7.1.2-27 or later. Inventory application containers and hosts for older `magick`, `convert`, `identify`, or ImageMagick library packages. Review code, job definitions, and image-processing templates for use of `-fx` or `fx:` expressions, especially where user input can influence arguments. After patching, rerun representative image-processing workloads and confirm there are no crashes, worker restarts, or memory-safety errors during FX operations. Vulnerability scanners and software composition analysis tools should no longer report ImageMagick versions prior to 7.1.2-27.

Typical attack path

1. Identify an application, script, batch job, or service that uses ImageMagick for image transformation.
2. Determine whether ImageMagick FX expressions are exposed directly or indirectly through parameters, templates, presets, or backend processing logic.
3. Submit a crafted FX argument designed to trigger the heap buffer overwrite in vulnerable versions before 7.1.2-27.
4. Cause the ImageMagick process, worker, or dependent service to crash or become unstable.
5. Repeat the request to create sustained denial of service, processing queue exhaustion, or operational disruption.

How to detect it

To assess possible prior exploitation, review application logs, job-queue logs, web upload logs, container logs, system logs, and crash-reporting telemetry for ImageMagick failures correlated with requests that invoke FX expressions. Look for repeated crashes of `magick`, `convert`, or dependent worker processes after processing user-supplied media or transformation parameters. On Linux systems, check `journalctl`, syslog, kernel logs, container runtime logs, and crash dump directories for segmentation faults, aborts, heap corruption messages, or core dumps involving ImageMagick binaries. In application telemetry, investigate spikes in failed image conversions, HTTP 5xx responses from media endpoints, queue retries, worker restarts, or out-of-memory/segmentation-fault events associated with `-fx` or `fx:` processing. If AddressSanitizer or hardened allocator logging is enabled, search for heap-buffer-overflow reports referencing ImageMagick FX code paths. No specific public exploit payload or attacker infrastructure is known from the provided data, so detection should focus on crash artifacts and suspicious use of FX expressions rather than network indicators.

• magick -fx
• convert -fx
• identify -fx
• fx:
• heap-buffer-overflow
• heap buffer overflow
• heap-buffer-overwrite
• heap buffer overwrite
• Segmentation fault
• segfault at
• core dumped
• AddressSanitizer: heap-buffer-overflow
• ImageMagick
• MagickCore/fx.c

What your security team should do

• Prioritize upgrading ImageMagick to 7.1.2-27 or later on systems that process untrusted media or user-controlled transformation requests.
• Search source code, container images, scripts, and job definitions for ImageMagick `-fx` usage and restrict it to trusted, static expressions only.
• Apply sandboxing and resource limits to image-processing workloads to reduce denial-of-service impact from malformed inputs.
• Inventory downstream applications that bundle ImageMagick rather than relying on the operating-system package manager.
• Monitor for unexplained ImageMagick worker crashes, segmentation faults, core dumps, or repeated failed image-processing jobs after publication of the issue.
• Because this is not currently KEV-listed and EPSS is low, handle as a timely patching item unless ImageMagick is exposed in high-volume, public-facing upload or media-processing paths.