CVE-2026-56378 ImageMagick CVE debrief

Who should care

Defenders responsible for ImageMagick installations, particularly those using versions before 7.1.2-15 or 6.x before 6.9.13-40, should prioritize patching or mitigating this vulnerability. Additionally, security teams and administrators managing systems that utilize ImageMagick for image processing should be aware of this vulnerability and take necessary actions to reduce risk.

Technical summary

The vulnerability is caused by a heap out-of-bounds read in the PCD coder's DecodeImage loop, which can be triggered by a crafted PCD file. This can result in a denial of service and potential disclosure of an adjacent heap byte. The vulnerability affects ImageMagick versions before 7.1.2-15 and 6.x before 6.9.13-40. The CVSS score for this vulnerability is 6.3, indicating a medium severity level.

Defensive priority

Medium priority due to potential for denial of service and data disclosure

Recommended defensive actions

• Apply official patches or updates to ImageMagick
• Review and update ImageMagick installations to ensure they are running a patched version
• Implement compensating controls, such as input validation and error handling, to reduce the risk of exploitation
• Monitor systems for suspicious activity related to ImageMagick
• Inventory ImageMagick installations to identify potential vulnerabilities

Evidence notes

The vulnerability is documented in the CVE-2026-56378 record on CVE.org and the NVD detail page. The vulnerability affects ImageMagick versions before 7.1.2-15 and 6.x before 6.9.13-40. Defenders should verify the affected versions and patch levels on their systems to determine exposure.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.