CVE-2026-87020 Orthanc CVE debrief

Who should care

Defenders responsible for Orthanc DICOM Server configurations and security should assess exposure and prioritize patching to prevent potential exploitation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify configurations, apply patches, and monitor for potential exploitation attempts.

Why it matters

CVE-2026-87020 is a HIGH-severity vulnerability in Orthanc DICOM Server that could potentially allow an attacker to execute arbitrary code on the affected system. Defenders should prioritize verifying configurations, applying patches, and monitoring for potential exploitation attempts.

• Verify patch availability and apply patches to prevent exploitation
• Monitor for potential exploitation attempts and review server logs for suspicious activity
• Assess exposure and prioritize patching for Orthanc DICOM Server configurations

Technical summary

The vulnerability is caused by an integer overflow in a specified pitch and buffer-size computation, leading to a heap out-of-bounds write when decoding an attacker-supplied PNG. This could potentially allow an attacker to execute arbitrary code on the affected system. The vulnerability affects Orthanc DICOM Server, emphasizing the need for defenders to verify configurations and apply patches to prevent potential exploitation. The CVE record and NVD entry provide details on the vulnerability, highlighting the importance of reviewing server logs for suspicious activity.

Defensive priority

Defenders should prioritize verifying Orthanc DICOM Server configurations and applying patches to prevent potential exploitation.

Recommended defensive actions

• Verify Orthanc DICOM Server configurations and apply patches
• Monitor for potential exploitation attempts
• Review server logs for suspicious activity
• Assess exposure and prioritize patching for Orthanc DICOM Server configurations
• Verify patch availability and apply patches to prevent exploitation
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability is caused by an integer overflow in a specified pitch and buffer-size computation, leading to a heap out-of-bounds write when decoding an attacker-supplied PNG. The CVE record and NVD entry provide details on the vulnerability.

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.